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).;
Philippine folk music famous in Tagalog and Visayan regions, employs a 3/4 time signature with a "crotchet-quaver-quaver-crotchet" beat. Others use the "crotchet-minim" scheme, while others use the "dotted quaver-semiquaver-crotchet-quaver-quaver" scheme. This type of music is generally recreational and, like traditional music from the West, is used for socialising. The court and folk dance music of the Muslim-Filipino groups have somewhat preserved ancient Southeast Asian musical instruments, modes and repertoires lost to Hispanicised islands further north. It is important to note that stricter interpretations of Islam do not condone musical entertainment, and thus the musical genres among the Muslimised Filipinos cannot be considered "Islamic".Genres