Living up to its name, tomorrow night's 'Mash Off' episode of 'Glee' features four creative mashups among its six musical numbers, including one that blends Lady Gaga's most recent hit single with a country track from nearly 30 years ago.

Will and Shelby offer a 'You and I' mashup that pairs Gaga's single with a chart-topping 1982 song of the same name by Eddie Rabbitt and Crystal Gayle. New Directions and Trouble Tones channel two '80s rocker chicks with a medley of Pat Benatar's 'Hit Me With Your Best Shot' and Blondie's 'One Way or Another.' Meanwhile, Santana and Mercedes lead the girls in two Adele tunes, 'Rumour Has It' and 'Someone Like You.'

Finn takes the lead on a New Directions mashup of two classic Hall & Oates tracks, 'I Can't Go for That (No Can Do)' and 'You Make My Dreams,' while the gents of New Directions, led by Puck, sing Van Halen's suggestive schoolboy crush anthem 'Hot for Teacher.'

In 'Mash Off,' Sue begins an evil smear campaign to take down her biggest Congressional competitor. Yet, fans will also see a different side of Sue, as a flashback to 16-year-old Sue, played by Colby Minifie, provides insight into why Sue has become a music hater. It turns out that at one time, young Sue actually wanted to perform on Broadway, but she changed her tune after her performance of 'Oklahoma' was mocked by observers.

'Mash Off' Episode Song List:
- New Directions (boys), 'Hot for Teacher' (Van Halen)
- Will & Shelby, 'You and I / You and I' (Lady Gaga / Eddie Rabbitt & Crystal Gayle)
- New Directions & Trouble Tones, 'Hit Me With Your Best Shot / One Way Or Another' (Pat Benatar / Blondie)
- Young Sue Sylvester, 'Oklahoma' (from Oklahoma!)
- New Directions, 'I Can't Go For That / You Make My Dreams' (Hall & Oates)
- Trouble Tones, 'Rumour Has It / Someone Like You' (Adele)