Mp3bot can play mp3s, mp4s, wavs, movs, and more. Just type "/mp3-BOT play" and attach a media file with your message, and the bot joins your voice channel and plays it instantly - free for everyone with mp3s.
Premium unlocks every file type, looping, playlists, and more. Slash commands supported too!
Let me know if you want it longer/shorter, or if you'd rather I drop the slash commands mention and keep it purely about the play feature.