Today, 'amateur' has become a byword for sloppiness and low standards. But for centuries amateurs were the bedrock of musical life and an essential and vitalising force for composers, providing not only a cohort of highly-accomplished performers and the most discerning audience but also a lucrative vein to be mined by music publishers. To find out how and why attitudes changed - and if they are still changing - Tom Service is joined by writer and historian Katy Hamilton.

David Papp (producer)