Audio Player, developed by wans7, lets you play audio directly inside the Blender interface, so you can listen to your favorite audio while working without switching between applications on your computer.
You open audio through the Playlist Panel, and you can open multiple files at once. Once audio is playing, standard media player controls are available, along with built-in volume controls for turning the sound up or down. Shuffle and repeat are both supported, and an 'Open' button lets you add more files to the playlist at any time. Playlists can be saved, so they remain in place when you close and reopen Blender. You can also adjust the audio position when it isn't where you want it.
The add-on is a Blender Extension compatible with Blender versions 4.0 through 5.1 and is released under the GPL license. Setup is straightforward, and documentation is included. A demo video is also available.