Edward Seckerson meets the prolific Frank Wildhorn ahead of the West End opening of Your Lie in April, his latest venture (after Death Note) into the realms of Japanese Manga. From one huge Whitney Houston hit – 'Where Do Broken Hearts Go' – to well over a thousand songs and countless musicals, his is quite a story. At one time in the late '90s he had three musicals running simultaneously on Broadway. One of them, Jekyll & Hyde, has become one of the most performed and most revered all over the globe, while 'This is the Moment' can lay claim to being the most sung competition and audition choice ever. Then there's the cult following growing for Bonnie & Clyde and the little matter of an 11 o'clock number he penned for Julie Andrews…