Chroma Key is the brainchild of ex-Dream Theater keyboardist Kevin Moore. It takes the form of very mellow and slightly somber, fairly ambient experimental progressive rock and electronica, which is predominantly keyboard-centred, having practically no common characteristics with what Moore had done with Dream Theater. Moore has released three albums as Chroma Key:
Dead Air for Radios (1998)
You Go Now (2000)
Graveyard Mountain Home (2004)

Read more about Chroma Key on Last.fm.