The following selections were found in iTunes for
Gerry Mulligan "Open Country":

Title	Artist	Album	PURCHASE
Open Country	Gerry Mulligan Quartet	The Gerry Mulligan Quartets In Concert
Open Country	Gerry Mulligan Quartet	At Storyville
Open Country	Gerry Mulligan Quartet	Gerry Mulligan Quartet, Zurich 1962 / Swiss Radio Days, Jazz Series Vol.9
Open Country (feat. Bob Brookmeyer)	Gerry Mulligan Quartet	Jazz Shots from the West Coast, Vol. 2
Open Country	Gerry Mulligan	The Gerry Mulligan Quartet + Spring Is Sprung (Bonus Track Version)
Open Country	Gerry Mulligan Quartet	Two Times Four Plus Six
Open Country	Gerry Mulligan Quartet	Ralph J. Gleason's Jazz Casual, Vol. 1
Open Country	Gerry Mulligan Quartet	Two Times Four Plus Six - Live