Bieber, Gaga set for 'Today' music series

NEW YORK, April 16 (UPI) -- Lady Gaga, Justin Bieber, Christina Aguilera and Carrie Underwood are to perform at this year's Toyota Concert Series on "Today" in New York, NBC said.

Also set to give mini-concerts this spring and summer outside the "Today" show studio in Manhattan are Maxwell, Ke$ha, Enrique Iglesias, Keith Urban, Rascall Flatts, John Mayer, Train, Katy Perry and the latest winner of "American Idol."

The concert series is to kick off May 14 with a performance by Sting.

Additional performances may be announced throughout the season, NBC said in a news release.