Slightly off the thread, but when I was learning to play guitar from LPs in the 60s, I found that when played at 16 2/3 speed, not only were the notes easier to catch at half the speed, but they were exactly one octave down, so I didn't have to re-tune my guitar! Helped me many times to catch hold of a particularly clever section of playing and settle some arguments and generate some new ones! Technology just make things too easy for us today.