In episode 28 Basara is desperate due to not being able to wake up Sivil nor being able to sing against Gavil and Gravil, which leads him to shoot a missile in rage, only for Gamlin out of all people to take the missile down and remind him that he should sing instead, Basara inmediately snaps out of it, his Sound Energy raises dramatically, and he joins the Sound Booster in midair, allowing him to repel the enemis with Holy Lonely Night, it has to be seen to be believed. Made even better by their later exchange:
Basara: Hey, Gamlin.
Basara: Raise your hand. *cue high-five*