Grammy nominated R&B vocalist Macy Gray has been drafted as the opening act for 13 stadium shows on Dave Matthews Band's upcoming U.S. tour. She will join the group beginning May 18 in San Francis

Grammy nominated R&B vocalist Macy Gray has been drafted as the opening act for 13 stadium shows on Dave Matthews Band's upcoming U.S. tour. She will join the group beginning May 18 in San Francisco and will remain until the trek's first leg closes July 15 in Dallas. Gray's top-5 single "I Try" is up for three Grammys, including record and song of the year. The artist has also been confirmed as a performer for tomorrow (Feb. 21) night's Grammy ceremonies in Los Angeles.

In other DMB news, the aforementioned tour has grown by a handful of shows. A second show was added for May 12 in Houston, a new date is on tap for May 14 in Albuquerque, and a two-night stand June 22-23 in Camden, N.J., has replaced the previously TBA June 22 date in Philadelphia.

As previously reported, the band will be on the road in support of its forthcoming RCA set "Everyday," which is due Tuesday (Feb. 27). First single "I Did It" is No. 8 on Billboard's Modern Rock Tracks chart this week.

Here are Macy Gray's support dates with Dave Matthews Band:

May 18: San Francisco (Pac Bell Park)
May 22: Los Angeles (Dodgers Stadium)
May 26-27: Las Vegas (Sam Boyd Stadium)
June 3: Detroit (Comerica Park)
June 6: Atlanta (Turner Field)
June 9: Washington, D.C. (RFK Stadium)
June 11: East Rutherford, N.J. (Giants Stadium)
June 16: Foxboro, Mass. (Foxboro Stadium)
June 20: Buffalo, N.Y. (Ralph Wilson Stadium)
June 22-23: Camden, N.J. (E Center)
July 6: Chicago (Soldier Field)
July 11: Boulder, Colo. (Folsom Field)
July 15: Dallas (Texas Stadium)