I’ve used the data that MPDQ creates to make a playlist generator for MPD. It makes it pretty easy to make playlists based on (currently) two criteria – genre and BPM. Using Zenity, you’ll get a prompt asking you where to save the playlist, which genres to include, then what BPM to center around (and how much variation there should be). Then, with just a touch of computer magic, you’ll get a nice playlist.
This kind of thing is important when you need a playlist of a specific BPM – like if you’re running for distance or doing another kind of cardio exercise. Personally, I find high BPMs good for focusing on work, but you can use this to quickly find low BPM tracks as well.
I hope you find it useful!