The trick with music notes radio transmission was used later in the classical Soviet sci-fi movie ,,The mystery of two oceans``(1955-56). By the way, the pianist looks 100% like Vladimir Lenin !
What kind of espionage agents are these ? They violated the two cardinal rules of secret agentry. 1) NEVER fall in love with the person you're trying to entrap 2) NEVER get involved with a co-worker, especially a subordinate.
