A \"deep riff\" within the Jonas Brothers has led the fraternal pop group from New Jersey to cancel its concert tour two days before its start, a spokesman said. \"There is a deep rift within the band,\" the group\'s representative Jesse Derris told People.com. \"There was a big a disagreement over their music direction.\" Their 19-date tour was to kick off Friday, but was scrapped after the siblings -- Nick, 21, Joe, 24, and Kevin, 25 -- had a huge argument. Asked what the future holds for the brothers, Derris told People.com, \"It remains to be seen.\"