There are more than one band with this name, including:
1) Zimmerman is the solo project for the Norwegian rocker Jarle Zimmermann.
2) Zimmerman is Dutch DJ Git Hyper's alter ego for his jazz projects.
3) Zimmerman is Belgian bassist and singer-songwriter Simon Casier (born 1987).
4) Zimmerman is an American Christian pop-rock band from Nevada.

1) Zimmerman is the solo project for the Norwegian rocker Jarle Zimmermann from Bergen. He is a former member of 70s country rock band Flying Norwegians and new wave rockers Elektrisk Regn.
Zimmermans most known song is cult classic Russerne Kommer (The Russians Are Coming!) from his 1981 debut album "LP 4".

2) Zimmerman is Dutch DJ Git Hyper's alter ego for his jazz projects.

3) Zimmerman is Belgian bassist and singer-songwriter Simon Casier (born 1987). Houdt van de muziek van o.a. John Frusciante, Beatles, Beck, Portishead. Op deze demo speelt Casier bas/drum/akoestische gitaar/toetsen/stem. Tegen eind 2009 wordt Zimmerman een viermansband waarin hij zelf de bas en stem voor zijn rekening neemt.
http://vi.be/bands/about/home.jsp?id=15742

4) Zimmerman is an American Christian pop-rock band from Nevada. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.