Based on the conclusion of last night's Glee episode - Finn/Quinn alert! - Rachel might be in a very bad mood on tomorrow's "Silly Love Songs."

But at least the New Directions member has chosen an inspiring song to cover on the Valentine's Day-themed installment.

We've got your first listen at Lea Michele unleashing her version of "Firework" in the video below. Under what circumstance does Rachel belt out this single? You'll have to tune in to find out. But what will it sound like when she does? That answer awaits...

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.