Last Month's top songs including new groups like A Pink, Chi Chi, Rania, Dal Shabet and Brave Girls and kpop veterans like SNSD, GD&TOP, Davichi, U-Kiss, 4Minute, Rainbow and F(x)!! I think you will really enjoy last month's top 20.
Disclaimer: This video is all my personal opinion. In Fact, not all of these songs were realeased in April not even 2011 or 2010. So really there songs I liked during the month of April or were stuck in my head haha.