Kirsty Young's castaway this week is the conductor, Marin Alsop.

Music Director of both The Baltimore Symphony and The Sao Paulo State Symphony Orchestra, she is a maestro with a mission: music, she believes, is a powerful vehicle for social change.

She had the good fortune to be brought up in "a household that exuded possibility" and was filled with music - both her parents played professionally. She took up the piano aged two, swapped to the violin at 6 and then aged 9, saw Leonard Bernstein at work and made the decision that conducting would be her career. Much later she would go on to be mentored by the man who inspired her.

It bores her when interviewers ask why there aren't more women conductors - nonetheless her capacity to maximise the few opportunities she was given as a young woman making her way in an exclusively mans' world gives one a flavour of her indomitability. Her day-to-day job after all is working out how to convince 100 experts to do what she wants.

She says, "maybe it's being an only child: you want to bring people together and create this big family feeling, I don't know what it is but I always gravitated towards organising."

Producer: Cathy Drysdale

Kirsty Young's castaway is the artist and director Steve McQueen.

These days his talents are well recognized - his art has won The Turner Prize and his most recent movie, "12 Years A Slave" scooped an Academy Award, a Bafta and a Golden Globe. He wasn't always as lauded: at school in West London he was "shoved to one side" in the belief that the best he could hope for was to earn a living as a manual labourer. Instead he portrays the extremes of what human beings put themselves and others through. Expression is where his heart lies - he describes it as "dancing with ghosts".

Along with reaching the top of two professions he has also managed to please the diverging demands of his parents - his father wanted him to get a trade, his mother urged him to do what he wanted.

He says, "I want to make films that are essential. We're all going to die and we haven't got a lot of time on this planet. Life goes very quickly, so we might as well make films people will go to see because they need it or want it."

Producer: Cathy Drysdale.

The writer Malcolm Gladwell is interviewed by Kirsty Young for Desert Island Discs.

Always concise, frequently counterintuitive and unexpectedly beguiling, his work orders the world in a way that gives fresh insights into human behaviour.

He believes that a knowledge of people's backgrounds is necessary to understanding their success; his own achievements may presumably then be attributed, not just to his keen mind and polished prose, but also to his parents - an English mathematician and a Jamaican psychotherapist.

He says, "I am the bird attached to the top of a very large beast, pecking away and eating the gnats.... I am someone who draws inspiration from the brilliance of others and repackages it ... I am a populariser, a simplifier and a synthesizer."

Producer: Sarah Taylor.

Guy Garvey, musician and frontman of Elbow, is interviewed by Kirsty Young for Desert island Discs.

Front man of the group "Elbow" his voice and lyrics have helped the band win pretty much every music prize going ... headlining Glastonbury too, and playing at the closing ceremony of the London Olympics. Yet his image is that of an everyday, low key, unassuming bloke ... except that he isn't, he's penning and performing songs filled with intimacy, optimism and lyricism, that strike a chord with millions of fans.

For a long while his devotees were well versed in the art of delayed gratification - Elbow's debut album was released 11 years after the band members first made music together.

He writes his songs in his journal and has been keeping a diary since he was 14. Maybe it was the peace and calm of the blank page that first appealed - one of 7 kids he says he was brought up "in a house full of women that were singing, shouting, arguing, fighting over the bathroom. I'm ruined by these women, spoilt rotten".

Fellow of both the Royal Academy of Engineering and the Royal Society, Dame Wendy fought long and hard to prove that her type of web science was highly significant and here to stay. If algebraic topology and open hypermedia systems really aren't your thing, Dame Wendy is also in demand as a brilliant communicator on, what can seem to outsiders to be, impenetrable topics.

Her parents were from humble beginnings and it was clear from the get-go that their first born had a budding flair for numbers: aged six she was charged with teaching a group of schoolmates maths. The first in her family to go to University she rejected Cambridge, judging it "too stuffy".

She says, "I get too excited about stuff. I love my life and am passionate about web science, women in science and shopping".

Producer: Cathy Drysdale.

Doug Allan is Kirsty's castaway this week.

A trained biologist he first made a living diving into the icy rivers of Scotland searching among the mussel-beds for pearls; a useful early lesson in patience and coping with the cold. His subsequent dedication to a working life in the wilderness has bagged him a slew of Baftas and Emmys but there's also been an emotional toll - he's coped with periods of depression and is twice divorced.

He says, "Big animals are my passion. I particularly love working with large mammals because they're intelligent and you can develop a relationship with them"

And he's at his happiest at -18 degrees centigrade!

Actress Anne Reid is interviewed by Kirsty Young for Desert Island Discs.

For a long time the bedrock of Anne Reid's successful career seemed to be her perfectly nuanced portrayal of a variety of northern mums - what she calls "skirt and jumper roles". Her first major role was playing Valerie Tatlock in Coronation Street - her character's funeral was watched by millions.

In 2003 the skirt and the jumper came off when she and Daniel Craig starred in the highly acclaimed movie The Mother, about a frumpy looking woman in her late 60s who passionately seduces her daughter's boyfriend.

Anne Reid has appeared in Victoria Wood's comedy series Dinnerladies and is currently playing Celia in BBC drama Last Tango in Halifax about two widowed septuagenarians finding love again.

She says, "...inner talent gives you that ease. It's not a remarkable thing - just a knack that gives you a very nice life."

Producer: Paula McGinley.

Professor Sir Michael Marmot is interviewed by Kirsty Young for Desert Island Discs. He's an epidemiologist who has spent his career studying what the key factors are in leading a long and healthy life and how your income and post code can affect your longevity.

Professor of Epidemiology and Public Health and Director of the Institute of Health Equity at University College London, Sir Michael specialises in what are known as the social determinants of health: how where we are in the wealth and status pecking order directly influences our chances of illness, disease and lifespan. Why is it, for example, that in 2014 in the same British city the average life expectancy for a man in one post code will be 82 but just a few miles away it's 54?

His pioneering research is often at odds with wider societal concerns over what are known these days as lifestyle choices - like smoking, not taking any exercise or eating junk ... he says simply "what I contribute to the policy debate is that I bring evidence - I don't do the skulduggery of politics.".

Kirsty Young's castaway this week is the singer-songwriter Lily Allen.

Less than a decade ago she dipped her toe in musical waters by releasing her demos on social media, this summer she's one of the headline acts at Glastonbury. It's 29 years since she first appeared at the festival; back then she was a new-born being carried through the crowd in swaddling. Indeed, she was as good as baptised at the font of celebrity culture - her dad, Keith, is an actor and writer, her mum, Alison, is an award-winning film producer - for a time her step-dad was Harry Enfield. So, it seems almost inevitable that she's ended up at the centre of a media-saturated life.

Except that in all likelihood she would have been propelled there entirely by her own endeavours: her lyrics are witty and wise-ass and capture concisely what it is to be a savvy, young woman today.

She says, "the only thing I can do really is write lyrics and the only way I know how to do that is by being honest and doing it with integrity because otherwise there's no point".

Producer: Cathy Drysdale.

Kirsty Young's castaway this week is Judy Murray.

A tennis coach since she was 17, she's the current British captain of the Fed Cup, the premier team competition in women's tennis, and was herself at one time ranked 8th in Britain - achievements worth celebrating.

But what she's best known for is being the ultimate tennis mum. Both her sons have reached the top flight of the game - one as Wimbledon mixed doubles champion, the other becoming the first Brit to win the men's singles in 77 years. In the moments after Andy Murray's heroic win on Centre Court last year it was to her he turned pumping his fists and roaring - as if to say 'we have done it'.

Judy's many followers on social media know how she spends her time - countless hours travelling up and down the country coaching and working to inspire children to take up the game.

She says, 'I've always been competitive. I'm like Andy, or maybe he's like me - I wear my heart on my sleeve. And when something is great, then yep, I am right into it'.

Producer: Cathy Drysdale.