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Thread: Opera Terms

          
   
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    Opera Lively Site Owner / Administrator / Chief Editor Top Contributor Member Luiz Gazzola (Almaviva)'s Avatar
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    Quote Originally Posted by Florestan View Post
    I use the dummy image method and this other than being too tiny seems to work for me. I would have thought the numbers to correspond with the octaves (A-G, huh, 7 notes per octave, I thought there were 8?), but strangely they are shifted. But for some reason this keyboard is wider than the one posted above for the voices.
    It's because the eight one is a C (do) again. In the European notation, do-re-mi-fa-sol-la-si-do again. For example the C scale is written C D E F G A B C, the initial and final Cs being an octave apart.

    The keyboard above is longer because it is complete. That's a full piano keyboard.

    An octave is a mathematical concept. It means the interval between a pitch and another one with half (to the left) or double (to the right) its frequency. Those points in frequency - half or double - receive the same note name because they share the same pitch class, so a C 8 notes ahead is also called a C.

    If a note has a frequency of 440 hz, the note with 220 hz will be one octave below, and the one with 880 will be one octave above. They will all be called the same note class, but with a number that will indicate which one you are talking about - C3, C4, C5. This is called Octave Equivalency because these notes are melodically equivalent.

    Think of singing do-re-mi-fa-sol-la-si-do and then repeating from the last do, and then again. You'll be singing higher and higher but the melody will be the same.

    Last edited by Luiz Gazzola (Almaviva); July 24th, 2017 at 11:39 PM.
    "J'ai dit qu'il ne suffisait pas d'entendre la musique, mais qu'il fallait encore la voir" (Stravinsky)

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