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When we say that this Piano/Keyboard is 5 octaves,Does it mean that 5 complete octaves (CDEFGAB CDEFGAB CDEFGAB CDEFGAB CDEFGAB) or 4 complete octaves plus C in octave 5 (CDEFGAB CDEFGAB CDEFGAB CDEFGAB C)?

  • I would not take it for granted, that the lowest tone is a C. Where the range ends, is typically indicated by the number of keys. – guidot Jun 28 '15 at 11:17
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It's 4 octaves + C: CDEFGAB CDEFGAB CDEFGAB CDEFGAB CDEFGAB C. You count 4 octaves from the starting note and add the starting note again: C1-C2 (first octave), C2-C3 (second), C3-C4(third), C4-C5(fourth), C5-C6(fifth), as above.

The first example you provided: CDEFGAB CDEFGAB CDEFGAB CDEFGAB CDEFGAB is 5 octaves minus a minor second. The second example: CDEFGAB CDEFGAB CDEFGAB CDEFGAB C is four octaves.

You can see an example on wikipedia's page on piano:

Almost every modern piano has 52 white keys and 36 black keys for a total of 88 keys (seven octaves plus a minor third, from A0 to C8). Many older pianos only have 85 keys (seven octaves from A0 to A7).

Υοu can also see how many A's there are here:

enter image description here

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