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Background Music Mod is a client mod that allows players to play audio files directly using chat commands and a file name instead of using Minecraft's (rather restrictive and difficult to use) Sound Events system.
Run /bgm play <file_path>. The chat will return a number that corresponds to the ID of the source. It can also be looped using /bgm play <file_path> true.
Run /bgm stop_id <id>.
Run /bgm list.
Run /bgm stop_all.
Run /bgm debug whoami.
Run /bgm debug pwd.
The sources can be found on GitHub under a GNU GPLv3 license.