Flavio Premoli from PFM is my favorite musician with the Mellotron and the Moog.
If you understand Italian, this video will be more suitable, but even if you don't you can hear demos in it.
http://www.youtube.com/watch?v=MJGEY0LE9L4
The video concludes with Dove e' Quando parte 2 which is a great song to showcase the band.
Other interesting things you will see here is that the tape is from 1972 and is in rather poor quality. The hair of the band members is very dated from that era. And Italy did not get color TV until 1975 (amazing) so the tape is in black and white.