Like every movie, as well as the original TV series in the 1960s, it has the same iconic theme song, composed by composer Lalo Schifrin, and if you mention the term "Mission: Impossible", you would remember the theme as well. But is it true that the theme song contains a "secret code"? VERDICT:TRUEThe main theme has Morse code written into it - a form of communication that uses a series of long and short signals, represented by dots and dashes, to convey letters and numbers. In Morse code, the letter "M" is represented by two dashes (--), while the letter "I" is represented by two dots (..). - The jazzy theme was also written in the 5/4 time signature, which is unusual but popular in classical music.