Tebaldi was primarily a singer, but she learned enough tricks of the trade to convey the basic dramatic points in this and other roles. London was outstanding both as a singer and as an actor, and the role of Scarpia gave him material for an outstanding performance. The supporting cast is capable (particularly tenor Eugene Tobin as Cavaradossi), but never quite at the level of London and Tebaldi. The sound is not digital or stereo but is powerful and well defined. The images are black and white--but then, so are the plot and characters in Tosca. --Joe McLellan