Lead singer of the blues-rock band Dżem (Jam in English), one of the most charismatic artists in the history of Polish rock. He is considered one of the most influential Polish vocalist ever, and has been known to influence artists today with his rough stage presence.

Riedel's direct cause of death was cardiac insufficiency due to long time drug abuse (especially heroin).

Riedel's life story, including his drug abuse and band, can be seen in the Polish movie Skazany Na Bluesa.
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