Billy sang the 7th inning stretch at the Cubs v Mets last night at Wrigley Field.
You can watch the clip of him singing c/o the MLB website below.
You can download the video of the interview on our Media Page. (thanks Veji).
My pal and Chicago’s own Billy Petersen led an excellent 7th Inning Stretch tonight! -GP pic.twitter.com/CDDYAmrc4x
— Gary Pressy (@GaryPressy) July 20, 2016