Original: After working for the KGB , Theremin worked at the Moscow Conservatory of MusicGlinsky p. 341 , '' where Lev Sergeyevich had constructed musical instruments '' for 10 years where he taught and built theremins , electronic cellos and some terpsitones ( another invention of Theremin ) .
Simplified: After working for the KGB , Theremin worked at the Moscow Conservatory of MusicGlinsky 341 , '' where Lev Sergeyevich had constructed musical instruments '' for 10 years where he taught and built Theremins , electronic cellos and some Terpsitones .