"I know!" She's not exactly angry, just frustrated at their foibles, at the moment. But his comment about the musical scale, she gives him a startled look.

"Noa," she breathes, eyes going wide. "What if we weren't just supposed to repeat the whole piece on the same scale? Transposition? If we were supposed to scale it up or down by fifths as we went..."

Well, it was a clue to finding the end of their problems, at least.