As I walked in to the Post-Gazette Pavilion Tuesday, it was easy to notice the empty lines at the beer taps. While other concerts sell plenty of Coors Light for $5.50, the typical audience at the Fall Out Boy concert is in high school or middle school. Not too good for the beer distributors. Then again, it was good for anyone over 21.

The first act on stage was Cobra Starship. Images of Samuel L. Jackson in "Snakes on a Plane" came to mind. Singer Gabe Saporta was best known for penning "Snakes on a Plane (Bring It)," featured in the movie starring the notoriously profane movie star.

Victoria Asher stood out -- most likely because she was the only girl in the band. When she sang, she had a sweet voice that complimented Saporta's more punk voice. The band bade farewell to the fans, and left the stage.

Next up: Paul Wall. He and a sidekick offered a series of requests to "put your hands in the air." Their movements were limited to walking across the stage, bent elbow, and waving their hands up and down as if trying to kill a fly. For the most part, fans followed his directions. They were used to high school teachers telling them how to behave.

The Academy Is ... was up next. The Chicago emo band was led by William Beckett, who flailed his arms like Mick Jagger, Beckett flailed his arms, turned his back to the crowd, and leaned his back against the guitarist.

The hands were above the fans' heads -- with little imploring from the lead singer. A few put their hands down.

"Put your hands up for this song," he said.

The audience, conditioned from Paul Wall, followed his command. Following the song, the singer posed a question.

"How many of you have seen us before?"

Half the audience screamed.

"How many are seeing us for the first time?"

Half the audience screamed.

"Well, everyone who has seen us before ... this next song is an initiation for everyone else."

The whole audience screamed.

The singer was at times profane, at times considerate. After the band played the last song, he said, "Hot damn ... thank you guys so much."

"My name is Mark [expletive] Hoppus, and I will beg for your applause."

The singer for +44 -- which is Blink-182, minus one and plus two -- certainly didn't earn it. Hoppus hopped across the stage while strumming his guitar like an 11-year-old who just got his first musical toy. The highlight of their performance came when Asher from Cobra Starship came on to help, her clear delivery making Hoppus sound bumbled.

The band members have grown older; their fans have not. Those too young to see how mediocre Blink-182 was got the opportunity to see the band's average spin-off.

"Thank you very much Pittsburgh ... Feel the ROCK," Hoppus said before he left the stage. They would later.

9:07 p.m. The speakers blared Gym Class Heroes' "Cupid's Chokehold," sampling the Supertramp lyrics:

"Take a look at my girlfriend/She's the only one I got (ba ba da da)/Not much of a girlfriend/I never seem to get a lot (ba ba da da, ba ba da da."

The crowd chanted along.

Fall Out Boy's entrance was preceded by a video package about the band.

The lights dimmed, and the audience started to clap and stomp. The screen behind the stage flashed "Fall Out Boy" in cursive. Fireworks burst.

In the midst of fog and lights, Pat Stump, the lead singer, stood. He's chubby, and that might explain why he's not the face of the band. That privilege went to bassist-lyricist Pete Wentz, who is also the primary lyricist.

"How many high school and middle school kids are there here?" Wentz asked.

The crowd screamed in unison.

The highlights of the set were "This Ain't a Scene, It's an Arms Race," "Thriller" and a great cover of Michael Jackson's "Beat It," which Wentz told he audience was, "written about fighting, [sex], and dancing."

The highlight of the Fall Out Boy show for the teenage girls was when Wentz went into the middle of the audience and played guitar. Stump and the drummer stayed on stage, singing the tune and providing the beat. On the stage and away from the attention.