Sonic's Guitar

Sonic was originally planned to be in a band in the Sonic 1 Sound Test, but that idea was scrapped. Still he was only a singer and not playing guitar. That seems to be taken up by the cartoons...

AoStH

Sonic can be seen playing guitar for...the first time?

Sat Am

Sonic's guitar appeared twice--one was in the pilot.

The other was part of a make-shift disguise.

Underground

The guitar became a musical weapon and used throughout the series.

A red version similar to the Sat Am one was in the episode "Beginnings."

As well as a "baby" one.

Sonic X

Sonic never played the guitar...but Prison Island sure looks like one!...and it...didn't in the games...

Sonic Boom

Sonic picked up the guitar again. Red, like some of his past, and it's three-necked like Underground.

Movie

Sonic briefly plays a green guitar.