In a music-crit world, where the term “genre-defining” is a cliché, the biannual Southport Weekender festival still begs use of the phrase. Until now, there hasn’t been a particular musical artifact to point to when someone asks what Southport’s music is. Joe Claussell’s spiritual house? Norman Jay’s crate-diggin’ disco? Classics proves it to be all of the above: from Gloria Scott’s rare soul masterpiece “Too Much Love Making” through house touchstones by Night Writers and Masters at Work. This comp is a perfect illustration of Southport’s influence on dance music, and contemporary music in general.