If you're UK based, it might be worth catching tonight's 'Imagine' documentary on BBC 1 at 10.35. This week it features the qualities, art and background of falsetto singing, with contributors including Philip Bailey, Eddie Holman and Frankie Valli. There are references to the Beach Boys, the Bee Gees [[and I would also hope the Stylistics!) as well as other falsetto performances from the likes of Queen to choral singers. I see in the Mail On Sunday preview it quotes Eddie Holman as saying "I am one of the greatest singers of all time."!