Aerosmith's Steven Tyler (L) and Joe Perry attend a press conference for the new video game Guitar Hero: Aerosmith in New York, June 27, 2008. REUTERS/Lucas Jackson

Aerosmith frontman Steven Tyler joined Joe Perry on stage in New York to set the record straight about the future of the feuding rock group.

New York, I want you to know I'm not leaving Aerosmith, Tyler told fans in a surprise appearance on Tuesday night at a concert by Perry's solo side project, music web site reported.

Tyler, 61 and Perry, his songwriting partner of 40 years, then launched into a version of Walk This Way, one of Aerosmith's biggest hits, said.

The future of the band has been in doubt since a North American tour was cut short in August when Tyler fell off stage, and relations between Perry and Tyler deteriorated to a low this week with bitter Twitter messages and cryptic asides about whether Tyler is still with the band.

Tyler told celebrity web site after Tuesday's appearance that There is absolutely no validity to the rumor that Aerosmith is breaking up.

Perry said of Tyler's appearance at his concert. He just couldn't stay away. Asked about rumors the band was breaking up, Perry told None of that's true.