Esselfortium is the electronic music composer Sarah Mancuso.

Her music is often characterized by complex arrangements and emotive melodies, and has incorporated many stylistic influences such as IDM, ambient, rock, and game and anime soundtracks.

She experimented with music from a young age, briefly taking instrument lessons before opting for a self-taught approach. In 2003 she began studying electronic music production and adopted the Esselfortium moniker in late 2005.

In 2007, two of her songs were featured on the first volume of the electronic music compilation series One on Twoism shortly before the release of her official debut album A Terrible Flood that April. Her sophomore release Seventeen More Times was completed in May 2011 after four years of development, featuring 16 songs following a loose conceptual narrative. These releases encompassed fuzzed-out ambient/downtempo, cyberpunk-inspired drum and bass, with a wide variety in between.

In recent years, she has focused primarily on composing soundtracks for games. In 2012 and 2014, Back to Saturn X Episodes I and II were released as unofficial Doom II expansions, including a MIDI soundtrack with multiple contributions from Esselfortium. In 2015, she composed the soundtrack for The Incredible Baron, a sidescrolling strategy game.

Esselfortium's music can be heard at her SoundCloud page, Bandcamp page and official site. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.