Usually first few tracks are drum tracks (if a track sounds weird and is in the bass clef and contains a lot of C's and D's and F#'s, that is a drum track) (those tracks have the same CH, change them to CH 10)

Instruments (MAY be inaccurate)
Vibraphone = Fingered Ele. Bass
Marimba = Fingered Ele. Bass
Drawbar Organ = Strings 1
Harmonica = Orch. Hit
Accordion = EP 1 or Ele. Guitar (jazz)
Overdrive Guitar = Alto Sax
Acoustic Bass = Banjo or some ethnic instrument
Picked Bass = Flute
Percussive Organ = Acou. Grand Piano
Reed Organ = Honky-Tonk or Acou. Grand Piano
Muted Ele. Guitar = Overdrive Guitar?
Rock Organ = Dist. Guitar?
Acou. Grand Piano = Acou. Grand Piano
Dist. Guitar = Tenor Sax?