Was watching TV last night and stumbled onto VH-1 story tellers.
Grace Potter and the Nocturnals were introducing a new single....she started out saying thay were fooling around with an old Casio and a Mellotron in the studio and came up with this one...I didn't see a mellotron on the stage...but the iTunes single sounds like it may have one.
Vid on Youtube:
http://www.youtube.com/watch?v=MA_ode55DFA
VH-1 live version:
http://www.vh1.com/video/misc/789550/never-go-back-sneak-vh1-storytellers.jhtml