With high overhead costs, major labels are reluctant to release albums in styles outside the pop mainstream.

Though completely outside the pop mainstream the record has sold more than 400,000 copies.

She's now officially in the pop mainstream.

Styles discarded by the pop mainstream survive in the indie sphere.

When she began recording in the early 1970's, Ms. Raitt established herself just outside the pop mainstream.

Where the Broadway theater once defined the pop mainstream, by comparison to rock today it's just a small pond.

She then dropped out of the pop mainstream, working for some 20 years as a more jazz-orientated live performer.

This weekend's concerts offer a typically rich bill of fare that, while varied, stays safely within the pop mainstream.

Together, disco and new wave defined the values of today's pop mainstream.

Back then, it was easy to see what the two had in common: tabloid lives, mischievous lyrics, disdain for the pop mainstream.