
1) Basic piano scale 2) Certain key 3) Common key for Haydn 4) Composition in C major 5) Key of 20 Haydn symphonies 6) Key with no black keys 7) Key with no flats or sharps 8) No sharps, no flats key 9) Scale with no sharps or flats
Found on
https://www.crosswordclues.com/clue/c-major

The C major scale (often just C or key of C) consists of the pitches C, D, E, F, G, A, and B. Its key signature has no flats/sharps. Its relative minor is A minor, and its parallel minor is C minor. C major is one of the most common key signatures used in western music. Most transposing instruments playing in their home key are notated in C major;...
Found on
http://en.wikipedia.org/wiki/C_major
C major scale noun (music) the major scale having no sharps or flats
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.