Interesting. For some reason, I think I was more 'in tune' (pardon the pun) with the music when I was tying commercially. By the music, I mean late 50s, 60s and 70s solid gold. Since the music was slow, moderate, fast I've a feeling that it all evened out in the end. Pretty sure that when I heard songs that had a strong heavy beat, I tended to tye more precise and with a heavier hand. When tying for myself the music was more relaxing regardless of the speed or beat.