Warren G & Nate Dogg - Regulate

Mount up!

This one is for Emily, though it was bound to come up sooner or later. From 1994, the classic and damn slack Regulate;

The Wikipedia entry for this is comprehensive, I particularly like the way the propositions in this track are approached with an almost philosophical analysis;

"The equality that "rhythm is life ... and life is rhythm" is first proposed in this song."

"Key insights from this song include the fact that if your ass is a busta, "213" (what was Long Beach, CA ... presently a subsection of downtown LA) will regulate."

However you dissect the song, by whatever methods or school of thought; it's a classic.