TMZ is reporting that the Jonas Brothers may break up!

They've cancelled their fall tour due to a 'deep rift' in the band.

TMZ's sources say: "the rift exploded over the release of their next batch of songs. Each brother had a different vision of where they wanted to take the band, ranging from pop to hard rock. They all agreed on one thing -- releasing anything new would be a disaster, because the style would be all over the place."

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The brothers stopped by G105 earlier this summer and all seemed well.  Check out the videos here.