It's probably safe to say that the vast majority of professional library literature does not deal with music topics. Not regularly, anyway. As of today, however, this serial has jumped to the top of my request list:

Library Media Connection Magazine

LIBRARY MEDIA CONNECTION (LMC) is the professional magazine for school library media and technology specialists. Blending the best of THE BOOK REPORT, LIBRARY TALK, and TECHNOLOGY CONNECTION, LMC delivers proven, real-world practical information, professional development, and book and technology reviews by educators seven times each school year

According to some of the articles that were popping up in the Library Lit databases, this magazine feature music website reviews and copyright Q&A. Even if it's geared to elementary schools -- (isn't that what "school library media specialist" usually means?) -- it should offer some interchangeable and state-of-the-art technology updates.

Two websites that it reviewed lately:
- www.NaxosMusicLibrary.com -- a collection of 170k+ classical, jazz, blues and world music songs that you can license for educational purposes.
- www.azlyrics.com -- "We have a large, every day growing universe of lyrics where stars of all genres and ages shine."