Justin Bieber, Chris Brown to Headline NBC's 'Today' Summer Concert Series

The free live concerts begin May 18 with Usher; other acts include Maroon 5, Pitbull, Kenny Chesney and the American Idol winner, with more acts yet to be announced.

NBC's Today show has announced the acts for their 17th annual Summer Concert Series, and the lineup does not disappoint.

Toyota is again sponsoring the weekly morning live concerts, kicking off Friday, May 18, with Usher for his first-ever Today performance.

Returning to the summer concert series are Chris Brown and Justin Bieber. Last summer, Brown drew an estimated 18-20,000 people to Rockefeller Center, the biggest Today show crowd ever (beating out Bieber's enormous crowd in 2010).

The concert series will also feature newcomers Hot Chelle Rae in their first morning show concert, and two Today show favorites, Maroon 5 and Train.

For the country lovers in New York City, Kenny Chesney, The Band Perry and The Zac Brown Band will all be headlining free Today concerts this summer.

Something new this year: Today is partnering with Pandora to extend the concert series beyond the Plaza and into the web. Pandora will create three Today Summer Concert Series stations: NBC Today Rock, NBC Today Country and NBC Today Pop, featuring each of the artists appearing in the series throughout the summer.

Fans can catch the concerts for free on a first-come, first-serve basis outside Today's window-on-the-world studio, located at 49th Street and Rockefeller Plaza in New York City. Fans should arrive by 6 a.m. for best viewing, according to MSNBC.

Read on below for the full line-up. More acts and guest appearances are expected to be announced throughout the season.

May 18: Usher

May 25: Pitbull

May 31: American Idol winner and runner-up (special Thursday performance)
June 1: The Band Perry
June 8: Chris Brown
June 15: Justin Bieber
June 22: Kenny Chesney
June 29: Maroon 5
6: Flo Rida
July 13: Zac Brown Band
July 20: Hot Chelle Rae
24: Train
August 31: Jason Mraz with special guest Christina Perri