Not advocating or encouraging, but there are sites that can rip youtube videos and convert to audio format of different qualities and formats, even snip the video based on timestamps.

However, some videos may be restricted and won't be rippable. So you'll have to try and test to see if the ripping even starts or not.

That said, better ask the video owner if they would upload on spotify or some other platform. Some of these creators do. Especially given now that AI can produce these music easily.