With a membership that is entirely amateur, the Vienna Singverein has developed a reputation as one of the finest choral ensembles in the world. Made up of about 200 singers, it has performed under the baton of some of today's leading conductors, including Gergiev, Ozawa, Boulez, Mehta, Muti, Barenboim, and Koopman. Such podium stalwarts from the past as Karajan and Furtwängler have not only conducted the Singverein but have held an enduring relationship with the ensemble, both in concert and on recordings. The Singverein's repertory is inclusive of a vast range, from J.S. Bac...