Regarding Deus Ex Sheet Music
After a short search, I found this.
DX music is in .mod format, which works like a modified MIDI file -like a MIDI file with the appropriate soundbank attached-. This proprietary soundbanks (for lack of a better term) are put together by the composer, sometimes even on a song by song basis. And the sounds that comprise them are not necessarily setup to reflect the actual pitch the sample is sounding. So if you open a DX music file on a tracker program and you sit down with a piece of manuscript paper you might be able to actually transcribe the track, but an automatic conversion would be subject to error in the given example.
Also, sometimes there are effects written as notes into the tracks (ie: the beginning of “Synapse” or the “UNATCO HQ” tracks where the melody is written with a delay in mind to form a counter-melody with the original phrase. If you look at the track in the tracker program a simple algorithm wouldn´t be able to identify this. You´d have to implement phrase recognition features and my guess is that is much more troublesome and un-educational than a DIY approach.
So, pretty much not going to happen. But it was a nice thought.

If an apple bloomed everytime I heard one of those lines…
ask-pinkamena-diane-pie:
I just want to rest on my field alone while watching that lovely aurora…
This is a wonderful picture that really brings out the beauty this art-style is capable of.
Are you originally from Ponyville?
Maybe you can make the horseshoes into lyres or other instruments, or perhaps a 3D video game, without the video, and sell those! Things can sell really well, if have the right advertisement.

Anonymous
All great ideas. But you seem to be missing the point where I don’t possess any of the skills necessary to do… any of that.
Making a video game could be cool, if I knew anything about it.
Hey Lyra! Join me at the cafe for a drink? I'm just having water, but the place is mostly empty, if you wanted to rock out a bit. :3
Hello!
I would, but it’s really late (or early). I need to go to bed, I’m just trying to finish off the questions I have first.
We really do need to hang out sometime soon, though!
*teleports in*
Want to visit your past?
I would literally rather die. No thank you.
I ask this honestly, because I really don't know. How exactly is a lyre played? My best guess would put it somewhere similar to a harp?
*fears having just asked a stupid question*
Well, that’s actually really complicated, because lyre is a broad classification of a number of string insturments.
Some lyres are plucked, some are designed to be played with a bow string. I actually play mine with a pick like the original lyres.
This can give you some historical information.
And here’s a video of a Contrabass Lyre being tested.
What I play when preforming live is the closest approximation of the definition of the word lyre, which sort of just looks like a small harp. But I’ve mentioned before that I actually own three lyres. One of them is a concert-style cithara. That’s what I typically record on.
Alex: I don't think i understand. What is going on between you and Type?
My wanting him to leave me alone, and him wanting… me to say he’s a good pony?
Acceptance?
I don’t know. I just want him to leave me alone so I can stop thinking about the past.

Anonymous
I’ll make believe that asterisks are real.
*Hugs*
You know, the lyre on your cutie kinda looks like a horseshoe. Are you sure you ain't in the horseshoe business?
Alternatively have you thought getting into the horseshoe business, if only to help you get back on track financially?

Anonymous
I find it funny that "lyre" is pronounced just like "liar". There is just no way an instrument that creates a sound that sweet is a lie. I'd call it a misnomer, but I'd rather leave the irony intact. It may sound like "liar" but man if it doesn't preach the true beauty of music!

Anonymous
Well, thank you. It’s nice to get something that doesn’t involve somepony I’ve done everything in my power to distance myself from civilly before tonight.
I sort of fell into the instrument by accident, but I do enjoy it! It is a beautiful and versatile tool. I also play the sitar a little, but I can’t imagine playing anything else as my primary instrument.
No idea if you’d still be willing to give me that now.