A recording session. A principle of jazz discographic practice, which J-DISC follows, is that the primary source of information about a recording should be according to where, when and by whom it was produced—at the point of musical creation. It generally has a definite leader or leaders and a single date, both of which are displayed in the session title.
A single session might take place over several very close dates, or several different locations in a performing tour whose dates are close. “Session” should not be confused with “Issue,” which may, or may not, contain all of the contents of a given session, and which requires a different set of metadata related to post-production and distribution of the recordings. (See below for more information on the distinction between “session” and “issue.”)