Led by siblings Eva and James Spence, Britain's Rolo Tomassi emerged in the late 2000s with an uncompromising sound that incorporated an eclectic blend of math-hardcore, acid jazz, and progressive punk. Taking influence from diverse artists like U.S. metallers Converge, prog rockers King Crimson, and jazz saxophonist John Coltrane, they found early success on Hassle Records with their Diplo-produced sophomore outing, Cosmology, before starting their own label to release 2012's Astraea, which introduced a new lineup and a more streamlined sound that continued on subsequent releases.