Last year, the Atlanta rapper Scotty teamed up with Southern smart-rap impresario DJ Burn One to release Summer Dreams, one of last year's great unheralded mixtapes. Today, Scotty follows that one up with his new mixtape The Jiffy Cornbread, a similarly laid-back and atmospheric country-rap full-length, rich in small details and bass tones. Soundtrakk, best known for Lupe Fiasco's "Kick ...