Its [[relative key|relative major]] is [[E major]]. Its [[parallel key|parallel major]], [[C-sharp major]], is usually replacedwritten byinstead as the enharmonic key of [[D-flat major]], since C-sharp major’s key signature with seven sharps is not normally used. Its enharmonic equivalent, [[D-flat minor]], having eight flats, including the B{{music|doubleflat}}, has a similar problem. Therefore, C-sharp minor is often used as the parallel minor for D-flat major. (The same enharmonic situation occurs with the keys of [[A-flat major]] and [[G-sharp minor]].)
