Monster Buster Club
The Sound of Moochie (2x23)
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Cathy's Aunt Freeda and her new husband Moochie show up unexpectedly to Single Town because Moochie has clingindwarfers disease(obsessed singing disorder) and Mr. Smiths garden is the only place that has the cure. But when Principal Rollins sees Moochie sing she asks him to sing the new school anthem in front of everyone only when Moochie sings with a microphone it gets so loud that things shake and break so the MBC tries to stop him from singing but they have no luck. Just in time Freeda shows up with the cure and gives it to Moochie and Single Town is safe one again.
(this is episode 49 on DisneyXD USA)