Swinging theme song from the television series Secret Agent, performed by Johnny Rivers. A Spanish version by The Plugz ("Hombre Secreto") can be found on the Repo Man soundtrack.

We had this lounge-style keyboard player at my wedding reception who kept playing all these unobtrusive, meandering songs. So I asked him to play "Secret Agent Man". I waited and waited, but didn't hear it. Then a few minutes later I realized that he was in fact playing "Secret Agent Man" -- an unobtrusive, meandering version of it. I thought that was so cool.