What is the primary key signature for E major?

The primary key signature for E major is indeed comprised of four sharps. In the context of music theory, every major key has a specific key signature that indicates the sharps or flats that should be used throughout the piece.

For E major, the four sharps specifically are F#, C#, G#, and D#. This configuration arises from the scale degrees of the E major scale, which ascends as follows: E, F#, G#, A, B, C#, D#, and then returns to E. Each sharp corresponds to one of the notes in the scale that is raised by a half step, contributing to the overall sound and harmonic structure of music composed in this key.

Understanding the key signature is crucial for musicians, as it guides the performer on which pitches to emphasize and how to interpret the written music accurately. In summary, E major's key signature of four sharps helps establish its unique tonal character and serves as an essential foundation for both written and performed music in that key.