If its the song I think it is Eileen, it is indeed worth finding. Rena introduced me and DJK to Herbie while on our travels in Scotland and England last November.
I think a child's lullaby would be amazing. Have you listened to his own song Lullaby? David's voice is so unique, I don't think I would have noticed him otherwise.
I would like to hear him sing Jealous Guy (John Lennon) or No Surrender (Bruce Springsteen).
We are family, I got all my sistas with me..