OCRemix for Megaman X and it's free!
Like Megaman X music? Heard of OverClocked Remix? Put them together...yeah.
OverClocked Remix, a group of musically talented individuals has released an album consisting of over 50 remixed Megaman X Tracks from X1 to X8.
It's an awesome download and above all it's free, check it out, and if you aren't convinced there are a few tracks posted on their youtube to listen to.
On a personal note, they remixed the Armored Armadillo Stage Music which we've all heard before even if you haven't played the games. It's the Sidescrollers intro music and it is awesome.
Link to the Download site
Also if your interested you can search through their main site for more albums, I have their Summoning of Spirits (with Tales of Phantasia and Symphonia music) and their Donkey Kong Country albums...well, they're good, good for your ears.