Phineas, Ferb, Isabella, and Buford are playing the theme song to Sonic Colors, titled Reach for the Stars! Looks like they're having fun with it, too. The song is awesome, so if you haven't listened to it, go do it now.
Geez, ever since people asked for this to be in the groups, it's been getting more favorites, but you're the first new comment. I guess people like fave and runs.
Yes, yes it is. I drew this because I loved Phineas and Ferb a whole lot (Still do!), and I had just heard Reach for the Stars for the first time (Also played Sonic Colors for the first time) and I thought "Maybe I should draw Phineas and Ferb and Isabella and Buford playing that song.... >8D"