I never have one of anything:

Red Clay Ramblers' "Birdie"--I probably play it four times for each time I play everything else on the album.

Red Stick Ramblers' "Deux-Pas des Condamnés"--ditto, at least for times for everything else on the album.

Hot Club of Cow Town "Cherokee Shuffle"--I bought the album just for that track. I've contemplated making a CD of just that, over and over.

any of several covers of "Moonshiner"--I just love the tune to that song.