Check out Beethoven's Moonlight Sonata, for example. As the barlines show, this piece is in 12/8. However, even if we ignore the barlines, there are several indicators that tell us this piece is in 12/8.
What key signature is Moonlight Sonata in?
Piano Sonata No. 14 (Beethoven)
Piano Sonata No. 14 | |
---|---|
Other name | Moonlight Sonata |
Key | C♯ minor |
Opus | Op. 27, No. 2 |
Style | Classical period |