What key signature has four sharps?

Answer 1

The key of E major and its relative minor, c sharp minor, both have four sharps. Additionally, key signatures apply to all music not just the piano and remain the same regardless of instrument. When referring to the piano the term "key" usually refers to on of the actual white or black keys that are pressed down to make a sound of the corresponding pitch. Each key on the piano is attached to a hammer that hits a string inside the instrument, thus the piano's classification as a percussion instrument. The strings are of different lengths and thicknesses, creating the different pitches. Each key on the piano is responsible for one pitch. Therefore a single key on the piano cannot "have four sharps", as you asked.

Answer 2

E major- F sharp, C sharp, G sharp and D sharp

Answer 3

E major, or C sharp minor. You can find it by finding the last sharp, then going up one half step.

Answer 4

A scale, and indeed, a key signature, of four sharps, can be found in E major and C sharp minor. The sharps in question are F sharp, C sharp, G sharp, and D sharp.

Answer 5

E major and C sharp minor

Answer 6

F# major and D# minor contain 6 sharps.