Hahaha, great find! Indeed very interesting why they really recorded it. I do agree in the 60s, 70s and even 80s the music was of a higher quality. The boundaries to make a record was so much higher those days, without computers, needing studios and all. When one wanted to create a record, one needed to spend a whole lot of money. Today this is not the case anymore with just needing a computer. That said, still today, some really good music is created, even with 'just' a computer, but it is harder to find the good stuff in between so much low quality stuff. While moderation in the past was done by money; Moderation has to be done by the listener today.