These are great suggestions. I'd like to add one:

"Last Month of the Year" by the Fairfield Four, on "Standing in the Saftey Zone".

The Fairfield Four is an a capella gospel group.

I'm not a Christian, or a big fan of gospel music except for being interested in its influences on blues, but this entire album absolutely rules.

The first track is an older (50's) recording. The rest is absolutely state of the art recording technology. Stereophile called this disc one of the best recorded albums ever made, which is why I picked it up. On a good system, the difference between track 1 and track 2 will almost knock you down.

I became a fan of the group. They are tremendous and are lauded by musicians from all genres for their musicality.

The voices are phenomenal and the barritone is so low he will tax the sub on a hip hopper's system. "Last Month of the Year" actually has some rather complex polyphony that reminds me of a fugue.

Jim