I thought those conflicting viewpoints in the other thread were interesting, too, and it got me to thinking about my group's repertoire. I would guess we do about ten percent new and the rest old or known songs. We do, however, try to vary the set by contrasting tempos, changing keys (major to minor, etc), rotating through three lead vocalists, and trying to vary the lead instumentation. If it seems appropriate we cluster several types of songs together, train songs, cowboy songs, civil war tunes, etc. Or, coversely, try to jump from old to new. Curiosity and unexpectedness have some validity. It's always a challenge and one is never sure the answers are correct.