C# / Db

C#/Db is an enharmonic pair found across many genres. As Db major, it is a lush, warm key favored in R&B, soul, and romantic classical works.

Chopin's "Raindrop" prelude (Op. 28, No. 15) is in Db major. The key of C# minor is perhaps most famous for Beethoven's "Moonlight Sonata." Both spellings appear frequently in classical piano literature.