Wallace West and Avery Ho are proud members of the Fastest Family Alive, and also, sometimes, they want to slow down and relax! Fortunately, there's a hot new app called Symphonee, bringing friends and fam together with the hottest sounds of the underground. Unfortunately, it's being brought to them by a conglomerate of Flash foes, including the Fiddler, Music Meister, and the Mad Mod. Have these old dogs learned some new tricks, or have they quit and gone legit with the freshest beats around? Because everyone's got music fever!