I was recently playing along, minding my own business, when one of my Sims switched their radio to the Pop channel.  I was quite startled to hear a song that I recognized (I liked it enough that I had purchased it on iTunes the week before) but in Simlish, of course!

Ever since the early days, The Sims franchise has gone the extra mile with the music on the available in-game radio stations.  EA tapped some impressive name-brand recording artists to record versions of their songs in Simlish for The Sims 3.  Even more "real" songs were added with the World Adventures expansion pack.

World Adventures is where Esmee Denters' version of "Outta Here" in Simlish came from.  If you listen closely, you may also hear chart topping songs by:

Pixie Lott, "Mama Do" hear it in English - in Simlish.
Nelly Furtado, "Manos Al Aire" hear it in English - in Simlish.
Rise Against, "Savior" will come with the next expansion pack Ambitions.  Hear it in English - in Simlish (Ambitions trailer).

LeAnn Rimes -  "You've Ruined Me" English - Simlish (Pop)
Fefe Dobson -  "I Want You" English - Simlish (Pop)
Katie Melua -  "If the lights go out" English - Simlish (Pop)
Madina Lake -  "Lets Get Outta Here" English - Simlish (Indie)
Manchester Orchestra -  "I've Got Friends" English - Simlish (Indie)
Natalie Portman's Shaved Head -  "Me + Yr Daughter" English - Simlish
Esme Denters -  "Outta Here" English - Simlish (Pop)
Hot Chelle Rae -  "Say" English - Simlish (Indie)
Audrye Sessions -  "Turn Me Off" English - Simlish (Indie)
Metalkpretty -  "Wake Up, Wake Up" English - Simlish (Indie)
Evan Taubenfeld -  "Pumpkin Pie" English - Simlish (Pop)
Friday Night Boys -  "Can't Take That Away" English - Simlish (Pop)
Cassie Steele -  "Summer Nights" English - Simlish (Pop)

Other songs seem to exist only in Simlish versions.  Some that I have tracked down so far are:

Eric Pressley, "Da Linnip"
Eric Pressley, "Feewa Foona Wabee"
Eric Pressley, "Podie Tie" (Indie station)
Darrell Brown, "Na Maa" (Kids station OH GOD MAKE IT STOP)
Ladytron "She Stepped Out of the Car" (Electronic Station)

And a third category of songs exist only in English versions!  You can find these in MP3 format if you go to Documents/Electronic Arts/The Sims 3/Custom Music

Floor Thirteen, "Blame it On Me"
Ladytron, "Ghosts"
Young Dre the Truth, "I Love LA"
Pint Shot Riot, "Punches, Kicks, Trenches and Swords"
Bang Camaro, "Revolution"
Dexter Freebish, "The Other Side"
Datarock, "True Stories"

You can add your own custom music to The Sims 3 simply by putting the MP3 into the Custom Music folder (alongside those English-only songs listed above).  These songs will play on the "Custom Music" station on your Sims' radios.  

It's fun to put your own music into The Sims 3!  And after all, with all the hours you spend playing it, don't you think their radio should play YOUR music?

One thing I haven't figured out is how to extract the in-game songs in MP3 format.  What if I want to listen to the Simlish version of "Mama Do" once in a while?  They must be in there somewhere, but damned if I can find them!