Format A or Format B?
But is the format "Oldies of the 50s and 60s" or "The Great American Songbook"? Diana Krall, for example, has recorded many things from the Great American Songbook but very few of her recordings were hits in the 50s because she wasn't recording in the 50s. The Stones had a lot of hits ("Oldies") in the 60s but not many were in a style of the G.A.S.
But is the format "Oldies of the 50s and 60s" or "The Great American Songbook"? Diana Krall, for example, has recorded many things from the Great American Songbook but very few of her recordings were hits in the 50s because she wasn't recording in the 50s. The Stones had a lot of hits ("Oldies") in the 60s but not many were in a style of the G.A.S.