Musical note standardised at 440 Hz, lying in the octave containing notes from C (middle C) to B. The lowest note on most pianos is A, the highest C. The MIDI system for electronic musical instruments and computers uses a straight count starting with note 0 for C at 8.1758 Hz up to note 127 for G at 12,544 Hz. A written note can also have a note value, a code that determines the note's relative duration. In order of halving duration, they are: double note (breve); whole note (semibreve); half note (minim); quarter note (crotchet); eighth note (quaver); sixteenth note (semiquaver).;
Promissory note a bank and payable to bearer on demand. Mortgage notes are another prominent example. If the promissory note is unconditional and readily saleable, it is called a negotiable instrument. Demand promissory notes are notes that do not carry a specific maturity date, but are due on demand of the lender. Usually the lender will only give the borrower a few days' notice before the payment is due. Promissory notes may be used in combination with security agreements. For example, a promissory note may be used in combination with a mortgage, in which case it is called a mortgage note. In