This is a list of MIDI sources that used to be there but are no more.
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http://midi-files-for-free.biz/ Large collection of pop-rock MIDI files <-- Seems down
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https://www.reddit.com/r/SongStems/comments/1vqwj2/i_got_more_stems_than_ive_got_gray_hairs_and/ Song stems -- apparently banned on Reddit
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https://www.reddit.com/r/SongStems/comments/17eiwr/hey_guys_i_finally_got_my_16ish_gig_stem/ Song stems -- apparently banned on Reddit