Rumor has it that legendary Detroit DJ/producer Jeff Mills turned 50 this week, and to celebrate, German blog Nerdcore has compiled seven classic mixes from Mills’ late-’80s WLJB Detroit radio show—which were recorded as The Wizard—and offered them for free download. The mixes clock in at about 30 minutes each, and sound as if they were recorded straight to cassette tape during their separate original broadcasts between 1986 and 1989. Even though their audio quality may not be great, the recordings still provide an insightful view into the mix of musical ideas that helped make Detroit such a fertile city for house and techno during that era. The Wizard’s seven classic mixes can be streamed and downloaded in the player below.