MUNA is magic. What other band could have stamped the forsaken year of 2021 with spangles and pom-poms, could have made you sing (and maybe even believe) that “Life’s so fun, life’s so fun,” during what may well have been the most uneasy stretch of your life? “Silk Chiffon,” MUNA’s instant-classic cult smash, featuring the band’s new label head Phoebe Bridgers, hit the gray skies of the pandemic’s year-and-a-half mark like a double rainbow. Since MUNA — lead singer/songwriter Katie Gavin, guitarist/producer Naomi McPherson, guitarist Josette Maskin — began making music together in college, at USC, they’d always embraced pain as a bedrock of longing, a part of growing up, and an inherent factor of marginalized experience: the band’s members belong to queer and minority communities, and play for these fellow-travelers above all. But sometimes, for MUNA, after nearly a decade of friendship and a long stretch of pandemic-induced self-reckoning, the most radical note possible is that of bliss.