My impression is that they play music when they are having technical problems with the new studio. Once they get the bugs worked out the music will probably be gone.
It seems they are playing songs from their original music library. The newest song I heard them play was "Sad Eyes" by Robert John which was released just a few months before they switched to talk.
Bingo! I am a PTP Family member, & when there are glitches on air, he goes into "music mode", & tries to correct the problem. I also believe that the music played are leftovers from KDWN's MOR days, as well.