I did something similar years ago for some funeral parlor music. I downloaded several classic rock songs in Midi format and edited them with a simple Midi editor. I eliminated all but the lead track then changed that instrument to church organ (I'm sure they have honky tonk piano as well). I also slowed the tempo down a bit. The result was songs like Hotel California played funeral parlor style! I loved the look of people tilting their heads while listening, because they sorta recognized the songs, but not quite!
Anyway, this is actually a very simple technique, since it requires almost no artistry. You just click a few buttons. See if your daughter's friend has a Midi editor.
Then, if you want to really make it creepy, load it into a music editor (I like GoldWave) and change the pitch to slightly flat.
Oh, and we are also doing the same theme this year with a Ghost Town facade. To get an idea on what scale, check out our
past facades.