User blog comment:Mobo85/Walt Disney Studios Cancels "Phineas and Ferb" Feature Film/@comment-4835804-20130817014007/@comment-6532917-20130817155018

The only characters who sang were Candace and Isabella, and the "Perfect Day" singers. Ironically, they COULD have had Spidey sing if they wanted. He sang in an episode of Ultimate Spiderman, which is the exact version of him that's in the special.