Lips

For this you need to score in any 20 songs of the I Love The 80s disc, you need to play the Full song not short. Also to make sure this unlocks correctly play all the songs in Solo mode.
Scoring can mean just getting 10 points, just as long as you score something and finish the song.

Here is a list of all the tracks you'll need to play:
“Alive And Kicking” by Simple Minds
“Bad Reputation” by Joan Jett and The Blackhearts
“Bette Davis Eyes” by Kim Carnes
“Blue Monday” ’88 by New Order
“Boys Don’t Cry” by The Cure
“Celebration” by Kool & The Gang
“Centerfold” by J. Geils Band
“Come On Eileen” by Dexys Midnight Runners
“Cruel Summer” by Bananarama
“Do You Really Want To Hurt Me” by Culture Club
“Don’t Get Me Wrong” by The Pretenders
“Don’t Go” by Yazoo
“Don’t Leave Me This Way” by The Communards
“Don’t You Want Me” by Human League
“Dreaming” by Blondie
“Forever Young” by Alphaville
“Gold” by Spandau Ballet
“A Good Heart” by Feargal Sharkey
“Kids In America” by Kim Wilde
“Let’s Dance” by David Bowie
“A Little Respect” by Erasure
“The Look Of Love” by ABC
“Love Is A Battlefield” by Pat Benatar
“Mickey” by Toni Basil
“Mirror In The Bathroom” by The Beat
“Our House” by Madness
“The Power Of Love” by Huey Lewis & The News
“Relax” by Frankie Goes To Hollywood
“The Riddle” by Nik Kershaw
“Rio” by Duran Duran
“Roxanne” by The Police
“Shout” by Tears for Fears
“Super Freak” by Rick James
“Tainted Love” by Soft Cell
“Too Shy” by Kajagoogoo
“Video Killed The Radio Star” by The Buggles
“Vienna” by Ultravox
“Walking On Sunshine” by Katrina & The Waves
“Whip It” by Devo
“You’re The Inspiration” by Chicago

If you are not much of a singer or just tired of singing, just make a noise at the start of a song to register a couple points, then wait a couple of minutes 'till the song finishes while you watch TV. Then repeat for the songs you haven't played yet. Must be sung in Full.