Pop" music is a type of popular music that many people like to listen to. The term "pop music" can be used for all kinds of music that was written to be popular.
Musical notation" is the way music is written down. Music needs to be written down in order to be saved and remembered for future performances.
Music can be produced electronically. This is most commonly done by computers, keyboards, electric guitars and disk tables. They can mimic traditional instruments.
