Giving Away a Coctails Box

Never got an answer to this when posted 2 months ago, but we have gotten a few decent guesses, so let's run it up the flagpole yet again and see if anybody salutes:

Trivia: In 1993, The Coctails held their record release party at the Division Street jazz club The Bop Shop. Who played the opening set for The Coctails at this coming out party for their genre bending, critic confounding, garage jazz album "Long Sound?"

First correct answer in Comments gets a free copy of "Popcorn Box" mailed to their home.

Hint #1: It wasn't Hal Russell!
Hint #2: Around the same time, the artist in questions opened on a bill for Corndolly and The Coctails.

And the answer is

Liz Phair