I have an iTunes card and it has 6 songs left. what songs should i buy?

I alredy brought Never Again ( Kelly Clarkson ) 4 In The Morning ( Gwen Stefani ) All Good Things Come To An End ( Nelly Furtado ) Hey Baby ( No Doubt ) Just A Girl ( No Doubt ) Justin Timberlake On Saturdy Night Live. and i have many more songs but i like pop kind of music. can you please help me choose?