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octave
In music, an octave (sometimes abbreviate 8va or P8) is the interval between one musical pitch and another with half or double its frequency.
Trivia about octave
This interval is an ottava
An 8-line stanza, it's usually the first 8 lines in an Italian sonnet
In music, one of these runs 8 notes, from C to shining C
It's an interval of 8 successive notes on the scale; C to C, for example
Normal range is about 1 of these plus another third; Minnie Riperton could handle about 5