The Perry Mason show had a number of established trademarks, which was actually a sure sign of any winning TV series. The theme music selected for the show was certainly one among them. Many remarked that the stirring and superb dramatic opening is unmatchable. Many in fact appreciated the sequence that consisted of the rise to holding note and a two-punch trumpet. This was followed by an extra-long pause, rise to holding note and three-punch trumpet. Eventually the song slides into a saxophone-to-full-brass glove, fully covered with whirlwind strings. On top of all this, the high sounding jazz piano adds up exactly the right touch. Fred Steiner was credited with the honour of composing one of TV's most popular theme songs.

Also, over half a dozen start up sequences of the show were actually little classics in their own regard, though critic Cleveland Amory, who was never a friend of the episodes, once stated that Burr was doing his best acting in these openings. Several years later, he apologized to Burr through a more favourable review of "Ironside".

Above all, most could agree with the fact that the most popular signature of the show was actually Perry's supposedly spotless record. Many people in fact kept wondering how he could possibly win every case.

A fan once asked Raymond Burr this big question, he said interestingly, "But madam, you only see the cases I try on Saturday." When TV Guide posed the same question to Burr, he remarked, "Perry is rather judicious in picking his clients and happens to believe correctly. What would you want us to do? Send an innocent man to the chair?" Erle Stanley Gardner was for his part rigidly set against having Mason ever lose any of the cases, simply since he didn't actually like his alter ego slog out for sixty tough TV minutes for letting a guilty party win.

It is mot interesting to note that as suggested by Edward Opack, "Park Avenue Beat" was the original title given to the theme music of Perry Mason show. A note published on the Perry Mason page at the Classic Themes website states that this title had been fully "verified in correspondence with the composer."