Apparently the song in the Mall trailer is "A Line In The Sand"
https://twitter.com/liljanetr7/status/471874309279842305
Thanks to Dimitris Papasinos from LPA for ask to Lilj. She was in the Listening Party last week.
This is how it would sound THP if they never changed the sound. And if you really want to know if it's Mike, simple record the song and play with the pitch.