Eflat

E-flat, often written as Eb or E♭, is a musical note a semitone lower than E. It is one of the 12 pitch classes in the chromatic scale and is commonly used in Western tonal music. In many contexts it is an enharmonic equivalent of D♯, meaning the same pitch can be spelled differently depending on the musical context.

In the standard 12-tone equal temperament system with A4 set to 440 Hz, Eb4 is approximately 311.13 Hz, with frequencies doubling or halving for other octaves. The note is named with a flat accidental, indicating a lowered pitch relative to its natural letter.

On staff notation, Eb is represented with the note head on the E line or space, with a flat symbol indicating the pitch is lowered by a semitone. Eb appears in several key signatures; for example, Eb major has three flats (B♭, E♭, A♭) and the relative minor is C minor. The parallel minor of Eb major is Eb minor.

Eb is widely used across musical genres, including classical, jazz, and popular music. It serves as a common tonic or dominant in pieces written in Eb major or Eb minor, and it frequently appears in brass and wind music due to its resonant, bright quality.

In other tuning systems or microtonal contexts, the exact frequency of Eb may differ, and composers may choose alternate spellings (such as D♯) to reflect different harmonic or melodic considerations.