musicologist
person who studies music as a branch of knowledge or field of research as distinct from composition or performance
music librarian
specialized librarian, usually with degrees in both music and librarianship
music theorist
person who studies music theory
ethnomusicologist
person studying ethnomusicology
Heather Professor of Music
title of an endowed chair at the University of Oxford
campanologist
person that studies bells
hymnologist
scholar of hymns