Matty Healy, the proudly enigmatic singer-songwriter of the 1975, leads his team into chamber-pop with “Part of the Band,” the first song from an album owing in Oct, “Being Humorous in a International Language.” He sings about “cringes and heroin binges,” about a “vaccinista tote-bag stylish barista” and about literary-minded homosexual liaisons — “I was Rimbaud and he was Paul Verlaine.” He also queries, “Am I ironically woke?” The production wanders from chugging string ensemble to fingerpicked people-rock to saxophone choir, with all of them mingling in the vicinity of the conclusion. It’s pandemic confusion, self-questioning and ennui, with melodies to spare. JON PARELES Alvvays, ‘Pharmacist’ A basic-spoken, everyday admission…