Mac Miller is being sued by '70s funk band Aquarian Dream for illegally sampling a song of theirs on his last mixtape. On his 2014 tape, Faces, the Pittsburgh MC sampled Aquarian Dream's 1978 single, "Yesterday (Was So Nice Today)" on the ID Labs-produced track, "Therapy."

And even though Mac released Faces for free digital download, members of Aquarian want to cash in on the use of their creative property. TMZ reports that the band is suing Miller for $150,000 in damages.

If you listen to both versions, it's fairly obvious that the Watching Movies with the Sound Off star ripped the tune from the '70s band. But Mac Miller's camp has claimed to have reached out to Aquarian Dream during the production of Faces, and when they got no reply on lawfully using the song, they went ahead with it anyway. Like the funky tune title suggests, maybe Mac should've thought twice about it yesterday.

Although infringement lawsuits are nothing new in the music industry, they've been happening a lot lately. Earlier this month, a judge ordered Robin Thicke and Pharrell Williams to pay Marvin Gaye's family $7.3 million for an illegal sample on "Blurred Lines." The Gaye Estate is also in the process of seeking to amend a judge’s decision to include not only rapper T.I., Interscope and Star Trak in the “Blurred Lines” suit.