Internationally recognized as one of the world's finest quartets, the American String Quartet celebrated its 30th anniversary during the 2005–2006 season. In over three decades of touring, the American has performed in all 50 states and appeared in virtually every important concert hall throughout the world. Their presentations of the complete quartets of Beethoven, Schubert, Schoenberg, Bartók, and Mozart have won widespread critical acclaim. The 1998 Music Masters Complete Mozart String Quartets, performed on a matched quartet set of instruments by Stradivarius, are widely considered to have set the standard for this repertoire.