The girls of "Glee" take on one of the most powerful voices in music next week -- and completely deliver!

In a sneak peek clip, Mercedes (Amber Riley), Santana (Naya Rivera) and the rest of the Troubletones tackle a mash-up of Adele's "Rumour Has It" and "Someone Like You," which is also the show's 300th musical performance.

Both songs are from Adele's "21," which is the biggest selling album in the world this year.

We're putting this one near the top of our Best "Glee" Performances list ... how about you?

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