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Playing locally in and around clubs in southern Germany, Switzerland and France since 1968 Dies Irae, consisting of Rainer Wahlman, lead vocals/harmonica, Harald Thoma, guitars/vocals, Joachim Shiff, bass and Andreas Cornelius on drums were finally discovered by the now long defunct Hamburg record label PILZ in early 1971. They were were a progressive psychedelic/blues freak band with a darker side from Saarbrucken, Germany who released just one LP and one single as well as appearing on the PILZ sampler, Heavy Christmas, in 1971 before splitting up in 1972 as a result of musical differences to form two offshoot bands, Lucy Gang and Green Wave.

Not to be confused by several metal bands which have used the name Dies Irae which literally translates to Day Of Wrath which is the title of a Latin hymn which refers to the day of judgement before the throne of God where the saved are delivered from evil and the unsaved are cast into the eternal flames, the original Dies Irae has been often compared to Black Sabbath's early sound on their LP "First" for PILZ because of a guitar/harmonica heavy blues sound with lyrical references to the occult although the vocals were far more trippier and out there. Extended psychedelic electronic collages and free form jams were also included on the sole album. 
Vibrationbaby (Ian Gledhill), Canada (progarchives.com)