The Baroque orchestra Tempesta di Mare, based in Philadelphia, has been one of the few American early music ensembles to gain attention in Britain and continental Europe, recording for the British label Chandos and appearing at a variety of European festivals. The ensemble was named after the several Vivaldi concertos named La Tempesta di Mare (The Storm at Sea). Tempesta di Mare was founded in 1996 by recorderist/flutist Gwyn Roberts and lutenist Richard Stone, who remain the group's co-directors. In performance, however, the group performs instrumental music without a conduc...