Hey! Spotiget’s Spotify to MP3 option fits a USB listening copy for your friend’s release. Paste the public track link, select MP3, and save the result to your computer before putting it on the drive. It builds the file from a matching audio source and adds the song tags and artwork. For that older stereo, I’d start with one track and see whether it reads both the file and its title. Use a plain folder name and check the stereo’s supported USB format, too. Once that little test works, you can organize the rest of the band’s songs the same way for the trip.