Few people were aware of the 1994 single “Insomniac” by the rock duo Billy Pilgrim, and it quickly sank into obscurity. But a cappella groups can’t stop singing it. We set out to find an explanation.

Overflow A Capella is a Christian, co-ed a cappella group at USC and was the was the first group to perform at All Hail. The group performed a cover of “Stayaway” by MUNA along with a gospel song.

When Deke Sharon (LA’91, NEC’91), a renowned a cappella arranger and instructor, joined the Beelzebubs in the late 1980s, a cappella song selection was limited. “Everybody was singing ‘Don’t Worry, Be ...