Hello all, I used to make music pretty regularly and I used the music from the original X-COM to learn bits of music theory and how to interface with FL Studios back in the day before I launched my (short lived) music career. I have some selected tracks available on my Soundcloud account that were inspired by the X-COM series, they are titled "The Siege", "Space" and "The Battle against the Unknown".
They can all be found here:
https://soundcloud.com/grim_wizardFeel free to use them in your mod, please credit "DJ Panzerschlag" if you do though.