Lonberg-Holm does not play an instrument in this group but rather conducts its non-idiomatic improvisations via the "lightbox" and by holding up handwritten signs.

Lonberg-Holm was a member of Terminal 4, which released an album in 2003 called When I'm Falling that received four and a half stars by Allmusic,[2] The Boxhead' Ensemble, Pillow, the Lonberg-Holm/Kessler/Zerang trio (with Kent Kessler and Michael Zerang), and the Dörner/Lonberg-Holm duo (with Axel Dörner).

When he lived in New York, Lonberg-Holm collaborated with the rock group God Is My Co-Pilot pianist and composer Anthony Coleman as well as multi-instrumentalist Paul Duncan of Warm Ghost.

[3] In Chicago, he worked with Jim O'Rourke, Bobby Conn, The Flying Luttenbachers, Lake of Dracula, Wilco, Rivulets, Mats Gustafsson, Sten Sandell, Jaap Blonk, and John Butcher.

He performed improvised music in the role of a troubled composer who finds inspiration in the love of a couple he spots on the street in a short film for the Playboy channel.