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.
Musical Intervals. The term musical interval refers to a step up or down in pitch which is specified by the ratio of the frequencies involved. For example, an octave is a music interval defined by the ratio 2:1 regardless of the starting frequency. From 100 Hz to 200 Hz is an octave, as is the interval from 2000 Hz to 4000 Hz. The intervals which are generally the most consonant to the human ear are intervals represented by small integer ratios.