"Summertime" is a great song - so great that it's been covered 25,000 times since George Gershwin wrote it in 1934. One of the more enchanting - and special - versions of the jazz standard has just dropped from Nineteen Thirteen, an enigma of a Milwaukee band. Featuring Victor DeLorenzo on percussion and Janet Schiff on cello as its two permanent members, you almost have to see this group to believe it.