Help!!

I'm a (non-proper) singer in a 3-part harmony acappella group: There's a argument going down here between artistic perfection and "SOMETHING TO flippin' well sing!"

Dearest Mudcatters! Do you have/know any 3 part harmony adaptable songs we can sing? I am stuck in the middle between trying to sing 2 parts of a Cooper, Boyess, Simpson song and flippin nursery rhymes - I don't know songs - what do you suggest please???

Love and kisses, Hille