The key signature of 3♯ means that 3 notes are sharpened from the diatonic scale and shown as sharps in the staff notation.
F♯ Minor Scale & Notation
Family Chords
Harmonic Mixing
Selected Key
Compatible Keys
Pro Tips
↑ +1 Open Key → build energy
↓ −1 Open Key → cool down
↔ Relative key (m ↔ d) → mood change
One Night by Ed Sheeran is written in the 3♯ key signature, using the F♯ Minor mode with F♯ as its tonal center.
Rhythmically, the song follows a 4/4 time signature and exhibits a Minor tonal behavior, shaping how musical tension and resolution are perceived.
From a theoretical standpoint, this mode is built on the La = F# scale degree, defining its characteristic sound and melodic gravity.
For harmonic mixing and DJ workflows, this key corresponds to 4m in the OpenKey system.
All key and mode information on Keysignary is manually analyzed by Amri MF, a music transcriber, ensuring musical context and accuracy rather than automated detection.