New Found Glory has been said to be one of the reasons pop punk became wildly popular in the early 2000s. The band also is cited as the reason for the genre’s decline. Either way, the group hit the mainstream with tracks such as “Hit or Miss,” “Dressed to Kill” and “My Friends Over You,” earning it worldwide fame, spots on the Vans Warped Tour and hordes of rabid fans. While the band’s last few releases have been commercial flops, the fans have stuck around. With the release of a new album, “Radiosurgery” — and its incredibly catchy first single, “Summer Fling, Don’t Mean a Thing” — New Found Glory proves that pop punk is far from dead. New Found Glory plays the National on Friday, Oct. 21, at 6:30 p.m. $18-$21. 612-1900.