Singers Nick, Joe (back) and Kevin (right) Jonas perform on ABC's "Good Morning America" in New York August 13, 2010. (Reuters)

TORONTO - To paraphrase a line from The Who's Won't Get Fooled Again, meet the old JB who once was the new JB.

In a year where the new JB - Justin Bieber - has been nothing short of "swaggerific" in terms of popularity and ticket sales, the old JB - Jonas Brothers - almost seem dated.

But that hasn't stopped them from cashing in as was the case during the first of two nights at Toronto's Molson Canadian Amphitheatre before a near-capacity crowd of shrieking young girls Thursday evening.

Over the 90-minute set, Nick, Joe and Kevin Jonas looked a tad more reserved than previous tours that saw them frenetically working the stage when not doing the odd back flips and kicks. On this night, it appeared to be far more about pacing, with a few of them taking breathers while Nick Jonas had his spotlight moment with Who I Am.

Regardless, the Jonas Brothers - who managed to plug the hell out of their new film Camp Rock 2: The Final Jam with ads, posters, t-shirts and several mentions - were seamless early on with Feelin' Alive and the punchy dance-rock of Hold On drowning out the mind-numbing screams.

Working on a stage that featured three catwalks jutting into the audience, laser lights, a large video screen and a temporarily malfunctioning dry ice machine, Jonas Brothers polished off Year 3000 and Play My Music before delving into new songs from the Camp Rock 2: The Final Jam soundtrack. Heart And Soul featured several dancers behind them (including two fans) while Introducing Me had Nick Jonas rapidly delivering the three-minute song in under 137 seconds to win a bet with brother Joe.

The middle section had its miscues but was highlighted when opener Demi Lovato sang with Joe Jonas on I Wouldn't Change A Thing, a tune Faith Hill and Tim McGraw might consider covering at some point. And after covering The Beatles' Drive My Car, they nailed L.A. Baby as younger brother Frankie Jonas, 9, sang with Kevin and played tambourine.

After looking around at the dozens of home-made posters the young fans were proudly showing - something the new JB reportedly wasn't allowing at his Air Canada Centre show last month - Jonas Brothers hit a rough patch with a hip-hop segment that was basically filling time. Dancers and a deejay came onstage as Nick and Joe emerged in costume, the latter resembling a youthful Andre Agassi with long locks.

Occasionally letting fans take over the lead vocals, Jonas Brothers started to wrap things up with the piano-driven Fly With Me, a song which had the trio suspended on a small platform looking down on the crowd. From there the power ballad When You Look Me In The Eyes and Please Be Mine (which showed baby photos of them on the video screen) led into an odd '40s-era backdrop with four dancing couples for Lovebug.

Returning for the encore which ended with Burnin' Up - and enough pyrotechnics that would make Nickelback somewhat envious - Jonas Brothers left the fans temporarily forgetting about that other JB.