Here's how to find music journal-specific articles:
Log into Academic Search Premier (EBSCO)(above link) and click "Publications" on the top menu:
In the first field, type in "music," click the "by subject and description," and click "browse." EBSCO will show you a list of all music journals that will have accessible articles. Choose a journal and click its title.
Just above the "Publication details for [name of journal], you'll see "search within this publication" and click it. Then click "Search."
If you want more specific subjects within your desired publication, type a keyword in the second or third fields. Make sure you select a "Full Text" article to get the whole article.