REFERENCE SOURCES (encyclopedias, dictionaries, handbooks, manuals, bibliographies, etc.) are a great place to start your research. They provide general introductions to a wide variety of topics, can explain unfamiliar concepts, or help identify references for further research. There are a wide variety of general and subject specific reference sources that will provide information on a variety of topics within the Music discipline.
BOOKS tend to provide in-depth information on somewhat broad topics. They are excellent sources for researching:
ARTICLES in newspapers, magazines and journals tend to provide in-depth information on specific topics and are a great place to research both contemporary and retrospective topics in Music. Remember that if your instructor has asked for scholarly, refereed or peer reviewed sources, you will not be able to use an article from a newspaper or magazine. Even though they are not peer reviewed though, newspapers and magazines are still a great source for interviews of contemporary artists and composers.
Detailed listing of Library of Congress Subject Headings for Music - CLASS M - MUSIC
Mus = LP collection
M = Music
ML = Literature on Music
MT = Instruction and study