How Green Day's Billie Joe Helped FIDLAR Singer Kick Heroin, Make New LP

The self-titled 2013 debut album by the Los Angeles band FIDLAR was one of the most exciting punk records in recent memory, a raucous set of songs with titles like “Wake Bake Skate,” “Cocaine” and “Cheap Beer.” But for the band’s singer and primary songwriter, Zac Carper, the party had a…