Q&A. While we often think of expenses as salaries, advertising, rent, interest, and so on, the cost of goods sold is also an expense. The cost of goods that were sold needs to be matched with the pertinent sales on the income statement, just as commission expense must be matched with sales or other revenues.
In music, an octave (Latin: octavus : eighth) or perfect octave is the interval between one musical pitch and another with half or double its frequency. It is defined by ANSI as the unit of frequency level when the base of the logarithm is two.or example, if one note has a frequency of 440 Hz, the note an octave above it is at 880 Hz, and the note an octave below is at 220 Hz.
Starting with A, an octave is A, A#, B, C, C#, D, D#, E, F, F#, G, G#, and again, A. The interval between each two successive notes is called a half-step. Therefore, there are 12 intervals of a half-step forming what is called an octave. For starters, each octave up or down represents a doubling of frequency. For example, the A above middle C on the piano is set to the standard value of 440 Hz, so the A an octave above that has a frequency of 880 Hz. Now, the particulars. The half-step is the smallest interval recognized in Western musical theory.