Sacred Harp!
I have renewed my obsession with Shape Note singing—it must be in my roots. If you want to hear some music that is incomparably passionate, manically enthusiastic, totally unrefined, raucous, poorly recorded, repetitive, and unabashedly white (No complaints now, I gave you fair warning!) while still managing to praise God, go here and click to hear some of the mp3s. If you want to reproduce this type of music yourself, go here. If you're interested in the history, visit this site. Shape note singing is an Appalachian tradition- the notes on the page are different shapes to help people learn to read music. It's generally out of tune (like bluegrass, which is from the same area), because the people singing it aren't trained musicians, and the intervals tend toward open fifths—a very medieval feature. Anyway, if that description doesn't sound interesting you probably won't like it. It sure is very enthusiastic, though.