scott storch*Remember when music producer Scott Storch was at the top of his game? He was pretty much a-list. Now, he’s … not.

It’s come to this. He’s in a messy situation these days.

Storch is being sued by an aspiring singer … who claims she paid him mucho dollars to produce her album … but he was too drugged out to get the job done, according to TMZ.

The woman on the attack is Treena Ruberg … who claims Storch — who’s worked with superstars like Dr. Dre, Beyonce, Justin Timberlake and more — agreed to produce 6 songs for Treena in exchange for $45,000 back in October 2011 … $30k of which she paid up front.

According to Treena’s lawsuit, filed in L.A. County Superior Court, Storch acknowledged he had a previous drug problem … but insisted he was now “cured of his past problem” and would be able to deliver the tracks by the end of November.

But Treena says Storch straight up lied … claiming he “continued to have a drug addiction and other personal problems which rendered him incapable of producing any recordings.”

Now, Treena says she wants her $30k back … plus an additional $70k for all of the out-of-pocket expenses she incurred during the process … including plane flights, studio time and having to hire another producer.

Calls to Storch’s rep have not been returned.