query: In what 2011 songs did Swathi Reddy sing as a playback singer, and what titles was each song in?
answer: In 2011, Swathi Reddy sang as playback singer for two songs, "Unbelievable" and "A Square B Square", for the albums of her own film Katha Screenplay Darshakatvam Appalaraju and 100% Love, respectively.