Covering Johnny's 28-year spell with Columbia, it is of course impossible to include all his significant recordings in one CD, but this comes as close as any CD I've seen in providing a reasonable sample spanning the years.
The majority of the recordings represent the early part of his career (the fifties and sixties) but the seventies also get their fair share (and no more), which is as it should be. It is, however, worth noting that some of his early Sun classics (I walk the line, Hey porter) are re-recorded versions, although they aren't a lot different from the originals,
Several duets are featured including Girl from the north country (with Bob Dylan). Two that aren't listed as duets are Daddy sang bass (with June Carter) and There ain't no good chain gang (with Waylon Jennings). They most certainly are duets as you'll find if you listen to them; it's purely a track listing error.
With such classics as Ring of fire, Jackson, A thing called love, A boy named Sue, Don't take your guns to town and Man in black, all together on one CD, this is the best CD you're likely to find that represents Johnny Cash's music.
For those looking to go a bit further, you might try The Rebel containing 75 tracks from the fifties and early sixties, and / or The Collection, which contains 38 tracks, mostly from the seventies but with a few from earlier. Between them, they contain most of the tracks you'll find on this single CD, but much more. However, this single CD will satisfy many people.
A great album with all of the greats in one place. I wanted to buy this electronically but it suddenly disappeared from Amazon music and iTunes without explanation. The others I did find did not seem as good as this one.