Bruce Springsteen is probably the coolest singer ever.

During his concert at the Los Angeles Sport Arena, he did a super cool act by writing a tardy note for the 9-year-old fan named Xabi Glovsky. We all know that the Dancing in the Dark singer loves to have long energetic concerts and Xabi, his avid fan, chose to watch the lengthy show.

Because of this, Springsteen gave his fan the tardy note which said that "Dear Ms. Jackson, Xabi has been out very late rocking and rolling. Please excuse him if he is tardy!"

We're pretty sure that Ms. Jackson would be even happy to read Springsteen's letter.

Earlier, the 66-year-old singer also did a good act for the 91-year-old Jeannie Heintz during his show in St. Paul, Minnesota. Watch the video below.

Tags: Bruce Springsteen Dancing in the Dark Xavi Glovsky