The best alternatives to Music Player (Fabulous) are BoxPlayer, Musens, and Spotifast. If these 3 options don't work for you, we've listed a few more alternatives below.
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Koel Player is the official mobile player for Koel, an open-source music streaming server. The app itself is also 100% open-source, but you can purchase and download it from AppStore (Google Play counterpart coming soon) to support the project.