Planet Sonata is probably my favorite stage in Ristar. The first stage has you carrying metronomes to song birds and gradually activating the instruments for the stage’s background music. It all culminates in the stage’s boss fight, which attacks you to the rhythm of this theme! Planet Sonata is a perfect example of what makes Ristar special: it’s creative, unique, and introduces gimmicks and elements that are then discarded for the rest of the game in favor of other gimmicks.
If the early stages of Ristar don’t grab you, I would encourage you to at least try to stick around until Planet SonataAd: