Restoration
I will upload examples of background noise reduction and master restoration in here.
The first one is a badly recorded Badinerie, composed by Johann Sebastian Bach. There is a lot of background noise, the audio is clipped and it sounds really rough. I did my best to eliminate the background noise while keeping the high frequencies. I used a clipping reduction algorithm, and some EQing to compensate for any lost frequencies. Here is the raw vs. clean clip: