Dance Central

Updated: If you don't mind spending 240 Microsoft Points, Fatboy Slim's "Weapon of Choice" DLC is probably the easiest song to get this on.
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Whatever song you feel most comfortable with, that's the one you should go with. For me, it was Poker Face (on Easy). You could use Break It Down to practice, but I just kept performing it over and over.

You will need to get a Flawless on every move, including the finish. Unclear as to whether or not a Flawless Freestyle is necessary, but I'd just wave your arms in the air while the camera is going off just to be safe.

Have patience. Even on Easy, this one can be daunting.

EDIT: tsunamishadow recommends the Warm Up Challenge as opposed to Poker Face. So if you can't nail one, try the other.

I know its not much but Funkytown was incredibly easy i got it 3 times in a row with this song just have to remember to put one hand on your hip for the disco and you should be sweet :)

For most people, doing Poker Face on easy will be easy enough to net this achievement. I could not do it though, as i would always get at least one nice. I found that this was because i am not as good at leg movements as i am at arm movements. So for the people who are superior at arm movements the song Maneater is very easy. Even though its higher up on the difficulty scale, the song is almost all basic arm movements on easy. I'm not saying this is the easiest song to get the achievement but definitely a nice alternative for those who like arm movements or even if you just tired of playing Poker Face over and over. Hope this helps.

After trying all of the recommended songs several times and screwing up a move every time, I settled on "Pon de Replay" (on Easy of course) and got it on my third try. I would have gotten it on my second try, but I did the wrong move by mistake near the end.

A few things to note:

1) There are no moves that are done only once (other than the final pose). To be more specific, if a particular move is done once in a sequence, it's done either two-times or four-times in a row.

2) On "Sway", make sure that there is a gap between your two arms when you raise them from side to side. Also, keep your arms up the whole time - don't lower them...sway them;

3) On "Plead", bring your arms down to mid-chest (hands-together) before raising your arms to the other side of your head;

4) On "Keyboard", make sure to exaggerate the "keyboard" move with your arms and to move your left leg around as the flashcard suggests; and

5) On the final pose, make sure that your right leg is in front of the left and that you are flexing your left arm. It's pretty straight forward and easy as far as final poses go.

Finally, note that in certain parts of the song, it will alternate between "plead" and "sway" [in between the "dust-off" moves]. Keep an eye out for this.

It's a little strange that I found this one so easy, because it is not one of the easier songs on the list and it is a lot harder physically than most of the other songs. But, after so many failures on other songs, I thought that I'd share what finally worked for me.