This app was mentioned in 2 comments, with an average of 1.00 upvote
Download the free app Spinrilla. You can download the music when you have internet access, then it saves in your library to be played whenever.
Just get it you will not be sorry. Has every mixtape from almost every rapper. And really good DJ playlists. https://play.google.com/store/apps/details?id=com.madebyappolis.spinrilla&hl=en&referrer=utm_source%3Dgoogle%26utm_medium%3Dorganic%26utm_term%3Dspinrilla&pcampaignid=APPU_1_25nSVOu3EcmzoQTw9YCwAw