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).;
Debit note Debit note A debit note or debit memorandum (memo) is a commercial document issued by a buyer to a seller as a means of formally requesting a credit note. Debit note acts as the Source document to the Purchase returns journal. In other words it is an evidence for the occurrence of a reduction in expenses. The seller might also issue a debit note instead of an invoice in order to adjust upwards the amount of an invoice already issued (as if the invoice is recorded in wrong value). Debit notes are generally used in business-to-business transactions. Such transactions often