The best alternatives to bop.fm for iOS are Pragli, Covers, and ListenYo!. If these 3 options don't work for you, we've listed a few more alternatives below.
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MusicSource is an open source and free desktop music player. It is served as a Progressive Web App so it requires no installation and is available offline. UI is a clone of YouTube Music but it is meant to play you own files. No server, no ads, no tracking.
Clicker for YouTube TV is a standalone YouTube TV player for Mac. Features include launching YouTube TV right from your Dock, touchbar controls, picture-in-picture, live channel guide in the Menu Bar, dark mode, and much more.