Stonesour was formed in Des Moines, Iowa, in 1992 and disbanded in 1997. Some of the members joined another fast-rising Des Moines group, Slipknot. Stonesour then reunited in 2002 and became more popular the second time around, earning Grammy Award nominations in 2003, 2004 and 2006. At Terminal 5 tonight, they performed their brand of radio rock with an occasional touch of thrash. A little for all tastes, vocalist Corey Taylor even sang and played unaccompanied on guitar for a few minutes. Ready for large audiences, Stonesour will be playing international music festivals this summer.