An Airborne Toxic Event, that is.

This new poster for tonight's Gossip Girl season finale hypes the appearance of the band Airborne Toxic Event. With the already-buzzed-about Chair on chairs pic, of course.

How will it all go down in "The Wrong Goodbye"? Will Chair be together at long last? That remains to be seen, but the musical cameo looks like it will be prominent featured.

Should be a memorable episode, no matter how the fourth season comes to a close tonight. Check out a new promo for the episode featuring the band below:

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.