Since founding Big Machine in 2005 with a coltish 14-year-old first signing named Taylor Swift, Scott Borchetta has watched his empire grow to five labels. BMLG is now home to superstars Swift, Reba McEntire, Tim McGraw, The Band Perry, Rascal Flatts and Florida Georgia Line, as well as emerging acts A Thousand Horses, Justin Moore, Brantley Gilbert and Maddie & Tae, and has a projected worth of $300m...