Unfortunately, once Aria hears it she realizes that she was smeckledorfed: the tickling and multiple recordings she was submitted to weren't really necessary because her laughter doesn't even sound normal on the final version of their song edited by Adagio. It's not something that bad but she is still peefed and decides to give her friend a piece of her mind.
After a little arguing, they both came to the 'conclussion' that they should blame Sonata for all of this. After all, she is the one who came up with the tickling idea in the first place. They were about to get her when they suddenly realize that the only thing left in Sonata's seat was her backpack.
It doesn't past long before they saw a group of children getting out of an inflatable giant taco claiming that a crazy girl was so in love with it that went inside it without even taking her shoes off. Adagio and Aria told the kids to stay back and don't worry: they'll go find her and teach her a good lesson.