In my opinion, the new single "Circus" surpasses even the predecessor "Womanizer" - and of which I was already more than impressed! The new single from Britney's back beat very casual, has a good driving sound and the text is pretty awesome. After hearing it once, the song sets as catchy in the head and you almost want to hear the track over and over again. On the premium single, there are still three remixes of the tracks and the superior video for the song (in my opinion one of the best videos in Britney's career). In the basic version, there is then also next to the Main Version still a remix of "Womanizer".
So a great pop track, the easy 'Party makes' and should be in every Britney Collection.
By the way: on the eponymous album "Circus" is teeming of hits! The third single "If U Seek Amy" will certainly go back through the ceiling ...