Crescendo is an episode of High Above Them, the second in season 1 and the second overall.
On a particularly boring day for the people of the High Flyer, Ethan struggles to keep awake after a long period of little action and little sleep. He falls asleep, sending the High Flyer into a sprial. Brandon comes out of the engine room angrily and prepares to chew Ethan out when a beautiful melody rings out, calming Brandon and waking Ethan from his rest. Dark comes to the deck and looks to find that the radar is detecting high sound waves from a small moon. Sam suggests they visit, and the entire crew agrees enthusiastically.