Which musical symbol indicates a note is to be played with a sharp?

The symbol that indicates a note is to be played with a sharp is the sharp symbol, represented as ♯. This symbol, when placed before a note, raises the pitch of that note by a semitone. For example, if a note is written as F♯, it means that the F note should be played one semitone higher, producing the pitch of F sharp.

In musical notation, the sharp symbol is essential for altering notes within a scale or piece of music, creating variations in melody and harmony. It also assists in defining scales that include sharp notes, such as G major or E minor.

The other symbols serve different functions; for instance, the flat symbol (♭) lowers a note by a semitone, the natural sign (♮) cancels any previous sharps or flats applied to a note, restoring it to its original pitch, and the treble clef (𝄞) is a symbol that indicates the pitch range for higher voices and instruments.