If you want Video game music this site has 1000s of free midi files of classic games and more http://www.vgmusic.com/
and if want classical music this site also good with 1000s of files from the great composers but not as free, signing up gives 5 free midi files a day, paying is unlimited https://www.classicalarchives.com/midi.html
There also other sites you can easily find by looking and searching on google.
Pontin Level 140 Hobbit Burglar Leader of Second Breakfast Crickhollow Server.
other classes: Minstrel, Guardian, Captain, Hunter.
You could also give Musescore a try. People will upload their own scribed sheet music to the Musescore library and the program can save it as a Midi file. There are 1.5 million user scores that range in all genres. 51,000 uploaded pop songs.