Here are the quality setting on YouTube Music according to Google: Low Uses the least storage on your device Bitrate: 48 kbps AAC and OP

Here are the quality setting on YouTube Music according to Google: Low Uses the least storage on your device Bitrate: 48 kbps AAC and OPUS Normal Default setting Bitrate: 128 kbps AAC and OPUS High Higher-quality audio will use more storage on your device Bitrate: 256 kbps AAC and OPUS Seems like it is automatically set to normal on WiFi and Mobile Data. It also seems like there is another option for streaming labeled "Always High" which forces 256 kbps stream over bad connection. I typically only use Youtube Music for discovery then buy albums that I like (or rip them if they're not available for purchase). I, personally, have never experienced low quality audio on YT Music.