What's the definition of perfect pitch? Hmmmmm?

It's when you throw the banjo into the dumpster and it lands RIGHT ON the accordion.

How many folk singers does it take to change a light bulb (got to be careful here)?

Four...one to change the bulb and three to complain that it's electric.

And one of my favorites when you're in a folk circle... always refer to your capo as a "banjo stopper".