SXSW 2016: Vince Staples, White Lung + More Added to SPIN's Showcase at Stubb'sSXSW 2016: Vince Staples, White Lung + More Added to SPIN's Showcase at Stubb'sThey'll join previously announced headliners Deftones and Chvrches at the daytime event on March 18.Tim KaranTim Karan