Roots rockers Blues Traveler will not reschedule their planned July 34 shows at the Red Rocks Amphitheater in Colorado that were canceled due to singer John Popper's health problems, according to a press release from the band's label. The 32-year-old singer underwent surgery to clear a blocked artery in his heart. The group had expected to reschedule the shows, which have become an annual event. According to an earlier press release, "All public appearances through the end of the month have been postponed," including the live debut of the John Popper Band, initially scheduled for July 16 in Chicago. That show has been pushed back until after the group's debut, Zygote, is released Sept. 7. A spokesperson at the band's label said Blues Traveler plan to begin work on a follow-up to 1997's Straight on Till Morning by the end of the year.