You might be thinking of Muzak:
Muzak is a brand of background music played in retail stores and other public establishments. In 1981, Westinghouse bought the company and ran it until selling it to the Fields Company of Chicago, publishers of the Chicago Sun-Times, on September 8, 1986. Formerly owned by Muzak Holdings, the brand was purchased in 2011 by Mood Media in a deal worth US$345 million. - Wikipedia
It doesn't start with P, but it appears that there is a song that includes the word muzak in its lyrics, and the band name starts with P:
The Sound of Muzak by Porcupine Tree