not exactly sure about the range but heres a few standards...
summertime (
warning: done to death in the hsc...)
straighten up and fly right
mad about the boy
let's do it (let's fall in love)
mack the knife
wade in the water (more bluesy...)
mr bojangles
its only a paper moon
aint misbehavin'
basin street blues
zoot suit riot
sailing
it don't mean a thing if it aint got that swing (good for a vocal trio..)
boogie woogie bugle boy (ditto)