you could also download guitar pro and download some guitar pro files off the net for songs you like, when you open them up in guitar pro delete the guitar, bass, synth and vocal tracks and leave the drum tracks, export them as MIDI files and you'll have the full midi track for songs such as lamb of god, machine head or really anything you can find a file for.
open them up in your DAW and do some chopping to edit the MIDI's to the way you want them