I have plush butts on the brain. Check out my callipygian iPod mix:
Spinal Tap - Big Bottom
Queen - Fat Bottomed Girls
Sir-Mix-A-Lot - Baby Got Back
Harry Belafonte - Jump In The Line (what? you don't believe this belongs in a mix about nice butts? ahem...When she wind up she bottom she go like a rocket What a lucious lyric.
K.C. and the Sunshine Band - Shake Your Booty

dont forget Ying Yang Twins - Bad Bitch (cute face, small waist with a big behind)
.. or i guess anything by J.Lo would count too, hahaha