==Theme song== 
 I removed the following from the Theme section: 

 The wordless theme song appearing in the show is not actually sung by a human voice, but performed on an electric instrument, the Theremin. 

 This is the only place where I've ever seen this mentioned. I've always heard that the theme (at least in the second and third seasons) was performed by an uncredited soprano. It's possible a theremin was included in the instrumentation. Doing a Google search failed to uncover any reference to the voice being electronically created. If an authoritative source can be found for this, please feel free to reinstate this.