The MH752 has the most neutral/accurate profile out of the three, so in a vacuum where I don't know your preferences, it is the safest choice for music.

The Alpha S and Recon 500 are both about excellent bass performance. The Alpha S lets you adjust the amount of bass with its sliders, and the Recon 500 has some of the most nuanced bass you can get in any gaming product.

Value wise, if you're just using these for music, you may not need the extra features that the 752 and Alpha S come with. Both come with a dongle designed for gaming functions. The Recon 500 offers the best balance of sound performance and value for the money...again, if you're okay with a focus on robust, awesome bass.

If you're not planning to do any gaming at all, you might be better off looking at studio headphones in this price range for accurate music listening. The AKG K361 is an excellent place to start. Gaming headsets assume that you'll be using their microphone for comms and that you'll want to hear certain elements in the game that better help with locational listening. They're tuned more like a movie theater is usually, for fun and exciting listening. Studio headphones are designed for pro work and tend to emphasize the details and flaws in a recording.

Again, without knowing your personal tastes or intended use beyond "music," that's the best I can do! Cheers.