>>13942145as
>>13944013 suggested, look for an app called "Newpipe" (best download the version with sponsorblock) and download that. You wont find it on the google playstore, but
google.com will still redirect you to the correct source.
That app allows you to download youtube videos as mp3 and mp4s and plays it for you, either on newpipe itself or on an audio app of your choice.