Petrolz is a highly respected three-piece band in the Japanese indie scene, known for their musicianship, unique grooves, and mysterious identity. Formed in 2005, the band has gained a cult following despite limited media and social media appearances and no physical or digital music releases, except for a few out-of-print CDs sold at shows. Their new album "Ranhansha,” the first time digital release in the band’s long career, includes re-recorded and original songs from master tapes recovered from various abandoned computers and warehouses.