Today it's been a lot of Matt Pike, particularly High on Fire's blistering, mind-numbing "Death Is This Communion" and "Blessed Black Wings." But I'm at the end of my work day, now, so I'm finishing with a mellow masterpiece he played on, Sleep's "Dopesmoker" (a/k/a "Jerusalem"). This album has its charms, especially when one is trying to get into the "zone" of concentration or is about to succumb to, err, sleep. I'm sure there are other times, as well. Oh, to be 21 again.
http://www.youtube.com/watch?v=BbxxTbuolms