"Mantra-rock dada pythago-cubist orchestra": That's how the band Angine de Poitrine describes its music style. As niche as this sounds, the experimental math rock duo is now breaking into the mainstream — or at least building a cult following that can't be ignored. The two musicians claim to be 333-year-old time travelers from another planet; two aliens called Khn and Klek de Poitrine. They perform wearing polka-dot costumes and big-nosed papier-mâché masks, allowing the drummer and guitarist to remain anonymous. These lo-fi, hand-made pyjama-style costumes and masks — with the drummer's droopy nose flopping around randomly to tight beats — contrast with the band's technical proficiency and diverse musical vocabulary: Their foot-stomping tracks merge a wide range of influences, from 1970s prog rock to experimental jazz to funk to punk. The first viral push Angine de Poitrine formed in Quebec in 2019; their first album, "Vol.1," has been out since 2024.…