An affectionate tribute to the Glasgow-born musician, poet, humorist and painter, described by Billy Connolly as "the best-kept secret in Britain". Friends and fans recall a five-decade career, including his stints on John Peel's Radio 1 show and his turn as Buster Bloodvessel in the Beatles's Magical Mystery Tour. Phill Jupitus on Ivor Cutler : page 40