he of "don't worry...be happy" fame - and some audience participation!

http://ie.youtube.com/watch?v=PgvJg7D6Qck

Wow! Every single note nailed! Thankyou for that. I love the idea of the oy vey Maria for Jewish people!

Fantastic, I'd never seen him before. Thank you. I really enjoyed watching his clips!

Just had a look at his website too, fascinating.

The Swingle Singers use a similar vocal technique to Bobby. Have been to one of their concerts - fascinating - especially how they emulate the low bass instruments using vocal to create a 'backing track'.