Singer/songwriter John Mayer has announced a 21-city summer tour with Colbie Caillat and Brett Dennen opening. Mayer is continuing to tour behind "Continuum," his third studio album.

The tour kicks off July 2 at Milwaukee's annual Summerfest and finishes up Aug. 2 at Cynthia Mitchell Woods Amphitheatre near Houston, TX. Blackberry, which sponsored Mayer's 2007 summer tour, is back as tour presenter.

Mayer received a 2006 Best Pop Vocal Album Grammy for "Continnuum" as well as the Best Male Pop Vocal Performance Grammy for his single, "Waiting on the World to Change."

John Mayer tour dates:

July
2 WI Milwaukee Marcus Amphitheatre
3 MO Maryland Heights Verizon Wireless Amphitheatre
5 IN Noblesville Verizon Wireless Music Center
6 MI Rothbury, Michigan Rothbury Festival
7 ONT Toronto Molson Amphitheatre
9 NY Wantagh Jones Beach
10 NJ Camden Susquehanna Bank Center
12 MA Mansfield Tweeter Center
13 MD Columbia Merriweather Post Pavilion
15 NJ Holmdel PNC Bank Arts Center
17 OH Cuyahoga Falls Blossom Music Center
18 IL Tinley Park First Midwest Bank Amphitheatre
29 CO Denver Dick's Sporting Goods Park
21 UT Salt Lake City USANA Amphitheatre
25 CA Marysville Sleep Train Amphitheatre
26 CAMountain View Shoreline Amphitheatre
27 CA Irvine Verizon Wireless Amphitheatre
29 CA Chula Vista Coors Amphitheatre
30 AZ Phoenix Cricket Pavilion

August
1 TX Dallas Superpages.com Center
2 TX Woodlands Cynthia Woods Mitchell Pavilion

(The image accompanying this story is from Sydentcent.com.au)