KEVIN KLAUS/Arizona Summer Wildcat John Mayer rocks out at Cricket Pavilion in Phoenix on Monday night. Mayer is currently on tour with Counting Crows and has a new album out in September.

Co-headlining a tour is impossible. Somebody always has to play last. But when the Counting Crows and John Mayer played at Cricket Pavilion Monday night, both put on distinctly unique performances.

It's hard to say who stole the show, but crowd favorite John Mayer definitely grabbed the attention of every female in the house with hits like "Why Georgia" and "My Stupid Mouth."

Cooing and swooning teenage girls rocked in their seats and kept their eyes on Mayer as he bounced through his mellow, funk-like set.

The somewhat empty and barren stage was filled with the gyrations of Mayer, who felt his way through his nearly 75-minute set.

Mayer has come under criticism while on tour with the Crows for having only a few songs to play, but John put on an upbeat show and gave concertgoers a taste of what's to come.

Mayer played two new tracks from his sophomore release Heavier Things (due out in September) including "Come Back to Bed."

Possibly Mayer's best song of the night, "Come Back to Bed" showed that Mayer is moving away from the bubblegum pop that gave him stardom while also showcasing his skillful guitar work and soothing voice. This guy just might be around for a while longer.

The seasoned Crows put on an incredible acoustic set, pulling from their immense repertoire a collection of songs that took listeners from "Omaha" to "A Holiday in Spain."

The Crows are known for great live performances, and lead singer Adam Duritz promised a low-key acoustic set and delivered with incredible renditions of "Have You Seen Me Lately?" and "Rain King." The high point of their set came with the loud and electric fan favorite "Hangin' Round."

The Crows' 70-minute set illustrated not only their musical and lyrical talent but also their uncanny ability to mesmerize a crowd of all ages for over an hour. For a special treat, guitarist extraordinaire David Immergluck strummed a mandolin throughout much of the soothing set.

Duritz reached out to the audience through the piano while he played a heart-felt "Goodnight L.A."

Passionate hard-core Crows fans stood through the entire set that was both a treat to listen to and a pleasure to experience.

While Mayer may have been the man to sell the most tickets for the show, the Crows proved they've still got it by putting on a set that was endearing and powerful.

Maroon 5 opened the evening with energy and power as they soaked up the success they have seen with their hit single "Harder to Breathe." Fans danced and sang as the band played a short and energetic set.