Musicology is the study of music rather than the composition or performance of it.
Musicology can give us useful information about the music we perform, how it was performed in the past and what it meant to people in the past. Performers need musicologists to provide them with accurate scores. Musicology can also tell us about how composers have put notes together in a meaningful way. All of this knowledge is helpful to composers and performers. Ethnomusicology is a term used to describe musicology in relation to the music of the many different cultures in the world.