I'm surprised that I never see any other musicians talk about this. When slowing digital music to around half speed or lower, the resulting artifacts of hearing between the samples (warbly clicky tones) makes it very difficult to hear alot of notes clearly. True analog records were fine for this and so was tape, only requiring tuning a guitar to the lower pitch. It isn't so fine with digital though since the industry settled on 44.1k/48k hz sample rates. For half speed, 96k hz sample rate is good, and for quarter speed 192k hz is good (I have tested this myself with some of my old recordings in the past). So who sells high sample rate digital music these days? I searched through the sites listed here https://www.sony.com/electronics/best-music-download-sites-hi-res-audio for some otherwise common as rain old AC/DC for example, and I couldn't find it. Of course, the internet wisdom is that high sample rate digital music is a waste. It's not. It's damn useful to musicians. There are Super Audio CD's, but as far as I know they won't play on a computer. There is DSD, but the selection seems limited. I just want to get some high sample rate audio into my daw for transcribing without a bunch of digital artifacts in the way of the notes that I'm listening for.