Erkki-Sven Tüür's Architectonics IV is a part of the Architectonics series that includes 7 individual pieces for different combinations of instruments. No. IV is subtitled "PER Cadenza AD Metasimplicity", and it is scored for 4 players: violin/electric violin, bassoon, baritone saxophone and piano/synthesizer. The title Architectonics holds a symbolic meaning for Tüür, for whom the initial ideas for a new work often originate from its overall shape.