A long-overdue MotD debut for Madonna: “Rain” (1993) was reviewed by Billboard‘s Larry Flick as “a gorgeous, romantic moment from the sorely underappreciated Erotica opus. A slow and seductive rhyme base surrounded by cascading, sparkling synths inspires a sweet and charming vocal.”
After the tune starts in Bb major, a thundering, sweeping synth glissando (2:37), unaccompanied by any other context, knocks us off-balance. After a bit of key-of-the-moment wandering during the bridge starting at 2:43, we transition to C major at 3:03. The 3:45 mark is a reversion to the original key, followed by another step up to C major as the tune draws to a close at 4:05.