Mellotronists

Jimmy:
Most, if not all Genesis tunes are available at no cost on the web, 
in midi file format (*.mid).
Keyboard sheet music (and all other instruments) can be viewed or 
printed using a midi program like CakeWalk.  (view staff)  I think 
CakeWalk has a basic version for about $50.

Little ditties like Suppers Ready and Close To The Edge are available 
and the midi files are small (220 KB !).  Most of the midi files on 
the internet are excellent quality (accurate).  Mellotron tracks are 
usually labeled "strings" , "string ensemble" or "choir".

For people who don't read music, there is a "piano roll" display.

Clay