John Mayer's going back out on tour.  During a Google-plus hangout sponsored by Billboard Thursday night,  Mayer told fans his voice has fully recovered from the throat granuloma that sidelined him and he's ready to launch his first major concert tour in three years.

Mayer will hit 40 cities in four different countries during a tour in support of his 2012 album Born and Raised. Last year, Mayer was forced to cancel an entire tour in support of the album due to his vocal issues.

The tour officially kicks off July 6 at Milwaukee's SummerFest, but Mayer will perform two warm-up shows: April 25 in Tuscaloosa, Alabama, and April 26 at the New Orleans' Jazz Fest.   The tour continues into October.  American Idol winner Phillip Phillips will be the opening act for most of the dates.

Mayer, who graces the new issue of Billboard, took questions from fans and from Don Was, the producer on Born and Raised. Mayer expressed gratitude to his fans for being so patient, and for being able once again, to sing -- or even speak, for that matter. "It's really strange the way I went silent...If you know something is hanging in the balance so much, you sort of protect yourself from it by becoming very zen."

While Mayer joked about getting his voice back -- "I'm going to like go around and sing too much now," he quipped, before singing, "I'll have a tall black coffee, please..." -- the musician who has made headlines by at times shooting off his mouth seemed to admit being forced to be quiet humbled him.

"Look at me, I'm like Clark Kent now," he said, expressing how nervous he was before the first song he performed during the event. "I'm having all these feelings and stuff. I have all these feelings of doubt now...I'm much more fun to hang out with," he laughed.

Here are the tour dates:

4/25 -- Tuscaloosa, AL, Tuscaloosa Amphitheater - SOLD-OUT
4/26 -- New Orleans, LA, JazzFest
7/6 -- Milwaukee, WI, Summerfest - Marcus Amphitheater
7/7 -- Maryland Heights/St. Louis, MO, Verizon Wireless Amphitheater
7/9 -- Cincinnati, OH, Riverbend Music Center
7/10 -- Bonner Springs, KS, Cricket Wireless Amphitheater
7/12 -- Woodlands, TX, The Cynthia Woods Mitchell Pavilion
7/13 -- Dallas, TX, Gexa Energy Pavilion
7/16 -- Morrison, CO, Red Rocks Amphitheatre
7/19 -- Ridgefield, WA, Sleep Country Amphitheater
7/20 -- George, WA, The Gorge
7/22 -- Paso Robles, CA, California Mid State Fair
7/24 -- Wheatland, CA, Sleep Train Amphitheatre at Sacramento
7/26 -- Mountain View, CA, Shoreline Amphitheatre
7/27 -- Irvine, CA, Verizon Wireless Amphitheater Irvine

8/6 -- Cuyahoga Falls, OH, Blossom Music Center
8/7 -- Clarkston, MI, DTE Energy Music Theatre
8/9 -- Tinley Park, IL, First Midwest Bank Amphitheatre
8/10 -- Noblesville, IN, Klipsch Music Center
8/11 -- Springfield, IL, Illinois State Fair
8/13 -- Darien, NY, Darien Lake Performing Arts Center
8/14 -- Toronto, ON, Molson Canadian Amphitheatre
8/16 -- Hartford, CT, Comcast Theatre
8/17 -- Mansfield, MA, Comcast Center
8/20 -- Bethel, NY, Bethel Woods CenterfortheArts
8/21 -- Holmdel, NJ, PNC Bank Arts Center
8/23 -- Camden, NJ, Susquehanna Bank Center
8/24 -- Virginia Beach, VA, Farm Bureau Live at Virginia Beach
8/25 -- Burgettstown, PA, First Niagara Pavilion
8/27 -- Allentown, PA, The Great Allentown Fair
8/28 -- Wantagh, NY, Nikon at Jones Beach Theater
8/30 -- SaratogaSprings, NY, Saratoga Performing Arts Center
8/31 -- Bristow, VA, Jiffy Lube Live

9/1 -- AtlanticCity, NJ, Borgata Resort Spa and Casino Event Center
9/4 -- Charlotte, NC, Verizon Wireless Amphitheater Charlotte
9/5 -- Raleigh, NC, Time Warner Cable Music Pavilion at Walnut Creek
9/7 -- Tampa, FL, Live Nation Amphitheater at the Florida State Fairgrounds
9/8 -- West Palm Beach, FL, Cruzan Amphitheatre
9/17 -- Buenos Aires, Argentina, Luna Park
9/21 -- Rio De Janeiro, Brazil, Rockin Rio
9/27 -- Atlanta, GA, Aaron's Amphitheatre at Lakewood

10/1 -- Albuquerque, NM, Isleta Amphitheater
10/2 -- Phoenix, AZ, Desert Sky Pavilion
10/4 -- San Diego, CA, Sleep Train Amphitheatre
10/5 -- Los Angeles, CA, Hollywood Bowl

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