This is one of two episodes where Frasier's artistic ego becomes so overblown that he derails his own production; the other is "Ham Radio," in which he ruins his beloved radio drama.
Before the orchestra begins to play his jingle for the first time, Frasier says, "The time we have been waiting for is at hand. And with a simple bow to the Muse Calliope, let us begin." In Greek mythology, Calliope is the muse who presides over eloquence and epic poetry.
The German phrase in Frasier's (Kelsey Grammer) (long) theme song, attributed to Sigmund Freud is, "Himmel, was ist los?" That means, literally, "Heaven, what is loose?"; the English equivalent is "Heavens, what's the matter?" or "Heavens, what's going on?" Both are common expressions in English, although the word "Heavens" (Himmel) is not used so much these days as it was in Freud's.
Frasier (Kelsey Grammer) allows Roz's (Peri Gilpin) boyfriend to play triangle with the orchestra, saying, "...our triangle player called in with a touch of tinnitus"-- the clinical term for "ringing in the ears."
The title is borrowed from the musical "They're Playing Our Song" with the book by Neil Simon, the lyrics by Carole Bayer Sager, and the music by Marvin Hamlisch. The musical is based on the real-life relationship of Hamlisch and Sager.