The Note C#/Db

C#/Db as a musical pitch: its frequency, spellings, and the harmony built on top of it.

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. Its reference octave pitch is 277.18 Hz (MIDI note 61). The major triad on C# is C#/Db Major (Db – F – Ab), and the minor triad is C#/Db Minor (C# – E – G#).