In most of the venus I play, the songs require a bit of introduction. If I'm singing or playing someone else's song/tune, they deserve a mention or if I'm singing or playing a song/tune that I learned from someone else, they'll also get a mention (if I can remember). Some tunes have interesting stories that go with them, maybe what prompted me to write them or learn them. This leads to audience interaction and makes me much more comfortable.
As an audience member, I always enjoy a bit of patter from the performers. A performer who plays 5 or 6 songs with no interaction with the audience won't hold my attention unless (s)he's exceptional.