Any progression of chords moving in Maj or min 3rds, 5ths, 4ths, Maj or min 6ths, b5, or chromatic can have literally, any quality. Resolution of a progression is paramount to make sense. Improvising over such progression can be complex. Most Beatle tunes are of the standard variety of progressions (primarily based on vocals, quick and simple vocals, and great hooks.)
A vamp is a short progression, e.g. ii V7 I, repeated.

[Edited by griphon2 on 04-22-2003 at 02:22 PM]