There's more than one artist called Wolfgang Müller: #1: Wolfgang Müller (b. 1975) is German singer-songwriter from Hamburg. His first solo album came out in July 2007 and is called "In der Zwischenzeit". This is the Wolfgang in the photo. #2: Wolfgang Müller (b. 24 October 1957 in Wolfsburg) is a German artist, musician and writer.
He lives since 1979 in Berlin and is the founder of the Berlin based multi-media performance art group Die Tödliche Doris ('The Deadly Doris'), which lasted for 7 years from 1980-1987.