It's like words in literature. Why do we have letters for writing? It's just how it is.
notes
They read notes
notes of music
Music scores and notes - the notation of music. Music must be notated so that other people can play/sing it.
there are 7 notes
beamed notes are a music note with a flag.
Rhythm
Music Is Just a Bunch of Notes was created on 1972-05-06.
Harmonics in music are notes which are produced in a special way. They are notes which are produced as part of the "harmonic series".
Musicians read what is called sheet music in order to play music. which is notes you play on the instuments
The black notes on the RIGHT of their corresponding white notes
notes that move upward