I would say, probably(?), this would qualify as being: the earliest "mega compilation" of what you'd have to call an A&M "greatest hits" release from the vintage era (1969) and, certainly, the most oddball (next to the mono Dee-Jay Sampler). In the '60s: the in-flight musical entertainment aboard airlines was all made commercially available for consumers (sort-of "prerecorded mixtapes") on reel to reel. The program was called "Astrovision Stereo". There were compilations assembled by all the major labels -in all categories...*except* the Rock of the day; though you'd expect that- which would be given their own, dedicated tape album lasting three hours each. On this, particular one: the selections range all the way from Liza Minnelli's first album to Brass Are Comin'. Unfortunately, for me, there aren't any Phil Ochs or Boyce & Hart cuts included (but, again, I couldn't imagine the "Mad Men" crowd of the times wanting to hear THEM while trapped in a plane!); however, the obscure Nick DeCaro stuff as well as the Make It Easy On Yourself-Bacharach stuff (which I enjoy) are well represented.