Yah, I just spent an hour or more editing the Wikipedia article, and read Maddy's description:

5 nights at the LA Forum with Jethro Tull. We were opening our set at the time with the Lyke Wake Dirge, a grim piece of music from Yorkshire concerning pergatory [sic] and we all dressed in dramatic mummers ribbons with tall hats. The effect was stunning. 5 gaunt figures in line across the front of the stage, lit from below casting huge shadows, intoning this insistent dirge alarmed some members of the audience whose reality was already tampered with by 1970s substances. It was most satisfying.

I learned it from Buffy— Sainte-Marie, that is. O tempora, o mores! :-)