There are at least three bands named Decode 1) Greek electronic band.
http://www.myspace.com/decodeband 2) an Estonian alternative rock band.
http://www.myspace.com/wearedecode 3) a Swedish synthpop band in the 1980s
Decode, consisting of Jonny Andersen (vocals), Paw Larsen and Jimmy Jensen (both on synthesizers) with Micael Matzen (guitar) and Gert Holmfred (producer), released a single (Planet of Youth / Amazing Waves) in 1986

Read more about Decode on Last.fm.