I fully relate to the desire to have your music available in a way that does not require a constant connection to the internet, since listening to music on SPOTIFY on your SMARTPHONE costs money because of data rates.

I would suggest that you either buy a small DAP (digital audio player) like a Hiby R3 Saber that uses Micro SD cards for storage, or maybe get an older CD Player like a Sony D-NE320 that will let you convert your high quality ripped albums into ATRAC using the Sonic Stage software for PC, then you can have like, 7 to 10 albums on one CD-R and nobody can take that from you.

With Spotify or YouTube, there is no GUARANTEE that your favorite album or song is going to stay available forever.