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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. Scientific pitch notation - Wikipedia

   en.wikipedia.org/wiki/Scientific_pitch_notation

   An 88-key piano keyboard, with the octaves numbered and middle C (cyan) and A440 (yellow) highlighted. The table below gives notation for pitches based on standard piano key frequencies: standard concert pitch and twelve-tone equal temperament.

4. File:Piano Frequencies.svg - Wikipedia

   en.wikipedia.org/wiki/File:Piano_Frequencies.svg

   English: This is a 88 key piano layout with octaves illustrated and hovering that reveals the frequency for the key. (The numbered octaves are black on transparency. They will not show up if the image is displayed on a black background, such as if the background of your browser is set to black, or is black when you open images separately.)

5. A440 (pitch standard) - Wikipedia

   en.wikipedia.org/wiki/A440_(pitch_standard)

   An 88-key piano, with the octaves numbered and middle C (cyan) and A 4 (yellow) highlighted. A440 is widely used as concert pitch in the United Kingdom [8] and the United States. [9] In continental Europe the frequency of A 4 commonly varies between 440 Hz and 444 Hz. [8]

6. Musical keyboard - Wikipedia

   en.wikipedia.org/wiki/Musical_keyboard

   Harpsichords often extended over five octaves (>60 keys) in the 18th century, while most pianos manufactured since about 1870 have 88 keys. The lowest pitch (frequency: 27.5 Hz) of an 88-key piano is equivalent to a sub contrabass in the range name.

7. How Democrats Are Faring In First Tests Of The Trump Backlash

   data.huffingtonpost.com/2017/special-elections

   How Democrats Are Faring In First Tests Of The Trump Backlash An analysis of the special elections held since November offers some clues about the party's changing fortunes.