 2 is, as the title implies, a greatest hits compilation by country singer Johnny Cash, released on Columbia Records in 1971 (see 1971 in music).It combines older songs from Cash's years with Sun Records ("Hey Porter" and "Folsom Prison Blues", among others) with more recent hits, such as "A Boy Named Sue" from Cash's "At San Quentin" album and the Kris Kristofferson-penned "Sunday Mornin' Comin' Down".