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.
On the piano, the quintessential tonal instrument, the octave is divided into 12 equal semitones represented by the seven white and five black keys. But consider the zoomoozophone, invented in 1978 by Dean Drummond, a founder of New York's Newband. It which resembles a marimba but is 20 feet long and flexible, the octave is divided into 31 parts and thus is capable of producing many more subleties of pitch variation than the piano.