Article from a Scholarly Journal

An article from a periodical (usually peer-reviewed) aimed at the scholarly community.

Why would I use it?

How do I find it?

Use an index.
This is one of the best ways to efficiently find any kind of periodical article

Get a citation from a bibliography.

RILM (Répertoire International de Littérature Musicale)

Most periodicals you find in RILM will qualify as "scholarly."
RILM also includes dissertations, chapters from books, etc. You may also use these as sources.

Music Index Online

EbscoHost

The Music Index (paper)

To locate articles published prior to 1949, start with History of Music: An Index to the Literature Available in a Selected Group of Musicological Publications compiled by Ernst C. Krohn (Ref. ML113 .K77 1958).

Some periodicals you find will qualify as "scholarly," but not all. Look at the pages in Searchpath that illustrate the difference between popular magazines and scholarly journals. And look at Ulrich's.