Sources to look at

http://www.npr.org/music/
NPR stands for National Public Radio many people that know this website use it a lot. It's a virtual radio where you can see many types of music, genres, articles, music videos, radio programs, live concerts, and studio sessions. This is a website where you can look for new types of music and hear different type of music than what normally your use to. The purpose of the website is to let anyone who wants to explore more music.

http://www.williamepowell.com/pdfs/DefinitionsOfMusic.pdf
This document provides a variety of definitions from different point of views. Like the composer Elliott Schwartz defines music as the organization of sound and time. Not everyone see or understands music the same way and this document demonstrates it. In this document there is also some scientific definitions. The definitions inform people about what music is all about. I think that this a good source to look up many kinds of definitions of music.
Berenice S.