C♯

A C# is a music note.

Scale
A C# scale goes like this.
 * Major Scale: C#, D#, E#, F#, G#, A#, B#, C#
 * Minor equivalent: Bb minor.
 * Minor Scale: C#, D#, E, F#, G#, A, B, C#
 * Major equivalent: E major.
 * Modern Dorian Scale: C#, D#, E, F#, G#, A#, B, C#
 * Major equivalent: B major.
 * Minor equivelent: G# minor.

Songs
Songs completely in C# major. Songs beginning in C# major. Songs ending in C# major. Songs completely in C# minor. Songs beginning in C# minor.
 * Sail On
 * Still
 * Truly
 * You Are
 * Haven't Met You Yet
 * If Ever You're In My Arms Again
 * Weekend In New England
 * Ready To Take A Chance Again
 * Looks Like We Made It
 * One Moment In Time
 * Drowning
 * Pop
 * Livin' La Vida Loca

Songs ending in C# minor.

Songs in C# Modern Dorian.
 * Thriller

Trivia

 * The music note's enharmonic equivalent is a Db.