countdown

#1 Song of 2010 [VIDEO]
Criticized by some as being "irritating", the #1 song on our countdown achieved commercial success by topping the charts in eleven countries.
Which song could it be?
#2 Song of 2010 [VIDEO]
The collaboration between an up-and-coming rapper and the leader singer of an alternative band worked well with music lovers when it was released in the spring of 2010.
Who are we talking about?
#3 Song of 2010 [VIDEO]
You immediately recognize this singer from her crazy fashion sense, her catchy beats and bizarre (but cool?) music videos.
Who's got the number three spot on our countdown?