start to list down unforgettable song from 2011

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I have started to list down my favorite 2011 song for my end year party which usually has karaoke session. I usually boring to sing same song all over again although sometimes the song collection limited and only old song is available. I think many bruno mars song like Lazy song and train's hey soul sister are among favorite song in my list. There are many nice song I have listen in radio but not sure about the singer, I think I should search those song as well..How about you? What kind of song you like for 2011?