It is one of the best-known works by composer Fred Steiner,[1][4][5] although he did not receive credit for the theme until near the end of the series' run.
[6] CBS executives had wanted the theme music to convey the suaveness, sophistication, and toughness that they felt were the fundamental aspects of Perry Mason's character, as well as his dealing with criminals and crime.
That rhythm just seemed like what I was looking for: a contemporary beat for that side of him, and yet the symphonic sound to represent him as the kind of guy who goes to the opera.
[7]The original version of the theme music was recorded in Mexico, which was standard practice at the time.
[6] "Park Avenue Beat" was reused in the NBC series of Perry Mason television films starring the surviving original cast members.