Schitt's Creek. S04 E04. About a third of the way through the episode in the diner. The conversation makes it quite impossible to hear, but the melody is there. There is a line that is more noticeable at the end of the scene. It's a Canadian show, but the music often comes from all over. It's Perry-esque, at least from the bits I can hear.
Here's a download if needed. In this download, the time is from 6:35-8:20.
https://www.dropbox.com/s/rc328vxretdxv ... 4.mkv?dl=0