As I mentioned previously, I have been really addicted to Perfume's songs lately.
Right now it's been 'Chocolate Disco'; The sound's great, with a great beat. And the "chocolate disco" hooks are so addictive.
I am a new Perfume fan, but I really recommend their songs, in particular this one and "One Room Disco." I hope to get an album soon and then I will be able to do more of a comprehensive review. But despite being apprehensive about Perfume (I didn't know what to think of the auto-tuned vocals), the electronic sound is definitely unique to idol music, and making Perfume a breath of fresh air.