Ever since 2011’s album Eifelian AGS has been composing abstract odes to long lost worlds. Eocene followed in 2018, and Therium is the latest addition to this thematic cluster. It doesn’t stray far from the formula of beautiful soprano wordless vocalizations (Erin Welton) over a shimmering tapestry of guitars, bass and drums (performed by Scott Ferrell). AGS is quite capable of making melodic structured pop songs—last year’s excellent XIII proved that. Therium sees the duo exploring post-rock soundscapes , like Sigur Rós—ambient music using traditional rock instruments. It’s best listened to as a song suite, but there are highlights. The halycon “Animalia” sounds like a lost track from Cocteau Twins’ Victorialand while the euphoric “Mammoth” and “Dire” have genuinely catchy hooks. Therium is the soundtrack for an imaginary film full of hypnotic imagery.