...can be found here:

• at Gábor's Progressive MIDI Pages
• at Jeff Glatts MIDI-Seite
• from Studio Seventeen Productions
• At Mike Le Voi you get the complete program of Emerson, Lake & Palmer.
• For bass tabs, check out mxtabs
• or the bass tab archive
• or bassmasta.

• The first reference for synth stuff is the Synthzone.
• Fans of old synths can visit Vintage Synth Explorer or the Synth Museum.