Aside from that cover of Walken'sPoker face, I'm delighted to report that I don't recognize any of these songs.

Now, I shall return to the rock I live under.

From an audioporncentral.com post:

The top 25 most popular hit songs of 2009, according to Billboard Magazine:
The Black Eyed Peas – BOOM BOOM POW
Lady Gaga – POKER FACE
Lady Gaga Featuring Colby O’Donis – JUST DANCE
The Black Eyed Peas – I GOTTA FEELING
Taylor Swift – LOVE STORY
Flo Rida – RIGHT ROUND
Jason Mraz – I’M YOURS
Beyonce – SINGLE LADIES (PUT A RING ON IT)
Kanye West – HEARTLESS
The All-American Rejects – GIVES YOU HELL
Taylor Swift – YOU BELONG WITH ME
T.I. Featuring Justin Timberlake – DEAD AND GONE
The Fray – YOU FOUND ME
Kings Of Leon – USE SOMEBODY
Keri Hilson Featuring Kanye West & Ne-Yo – KNOCK YOU DOWN
Jamie Foxx Featuring T-Pain – BLAME IT
Pitbull – I KNOW YOU WANT ME (CALLE OCHO)
T.I. Featuring Rihanna – LIVE YOUR LIFE
Soulja Boy Tell ‘em Featuring Sammie – KISS ME THRU THE PHONE
Jay Sean Featuring Lil Wayne – DOWN
Miley Cyrus – THE CLIMB
Drake – BEST I EVER HAD
Kelly Clarkson – MY LIFE WOULD SUCK WITHOUT YOU
Beyonce – HALO
Katy Perry – HOT N COLD

My autotune sensors are overloading, failure imminent!