“Terra ignota” is the Latin phrase for “unknown land”: that uncharted territory unmapped by cartographers, where knowledge gives way to blank space filled only by imagination and speculation. It’s an apt title for Krakatau’s follow-up to 2016’s Tharsis Montes/Apogean Tide, as the Melbourne instrumental trio has spent the interim period exploring new sonic worlds such as contemporary jazz, world folk musics and the post-minimalist music of the 1980s and early ’90s. On Terra Ignota the synth-bass-drums combo add significant outside contributions to their jazz-funk-prog explorations, with trumpeter Reuben Lewis featuring on the digi-minimalism and fourth-world atmospherics of the title track, while the melancholic saxophone of Robert Vincs is the centre piece of “In Memory (Folie Adieu)”. Brazil’s Alcides Neto features on “Birds of Passage”, embellishing its percussion-heavy Latin fusion with wordless vocals, while the 17-minute, three-part “Cosmetic Surgery” is an epic trip through soundscapes, Latin fusion and contemporary jazz. Krakatau may be in uncharted territory on Terra Ignota, but exploring it makes for a wild, spellbinding listen.