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2. Piano key frequencies - Wikipedia

   en.wikipedia.org/wiki/Piano_key_frequencies

   The normal 88 keys were numbered 1–88, with the extra low keys numbered 89–97 and the extra high keys numbered 98–108. A 108-key piano that extends from C 0 to B 8 was first built in 2018 by Stuart & Sons. [4] (Note: these piano key numbers 1-108 are not the n keys in the equations or the table.)

3. Half-diminished seventh chord - Wikipedia

   en.wikipedia.org/wiki/Half-diminished_seventh_chord

   For example, for the chords "Dm7 ♭ 5 G7 ♭ 9, play down the B♭7 scale from its seventh to B" (B being the added half-step "bebop note" and third of the G7 ♭ 9 chord). This works because the notes of the Dm7 ♭ 5 chord { D F A ♭ C } are also chord tones of B ♭ 9 { B ♭ D F A ♭ C }.

4. B-flat major - Wikipedia

   en.wikipedia.org/wiki/B-flat_major

   B-flat major is a major scale based on B ... B-flat major is one of the most popular keys for concert band compositions. ... The scale degree chords of B-flat major are:

5. Degree (music) - Wikipedia

   en.wikipedia.org/wiki/Degree_(music)

   In music theory, the scale degree is the position of a particular note on a scale [1] relative to the tonic—the first and main note of the scale from which each octave is assumed to begin. Degrees are useful for indicating the size of intervals and chords and whether an interval is major or minor .

6. Quarter tone - Wikipedia

   en.wikipedia.org/wiki/Quarter_tone

   A quarter tone is a pitch halfway between the usual notes of a chromatic scale or an interval about half as wide (orally, or logarithmically) as a semitone, which itself is half a whole tone. Quarter tones divide the octave by 50 cents each, and have 24 different pitches. Trumpet with 3 normal valves and a quartering on the extension valve (right)

7. Scale (music) - Wikipedia

   en.wikipedia.org/wiki/Scale_(music)

   For instance, in a chromatic scale each scale step represents a semitone interval, while a major scale is defined by the interval pattern W–W–H–W–W–W–H, where W stands for whole step (an interval spanning two semitones, e.g. from C to D), and H stands for half-step (e.g. from C to D ♭).