Cloud next to my songs on my iPhone?

I have an iPhone 4s with IOS 7 on it, when I go to my music and select a song there's a cloud on it and when I try to listen to the song it does not play. Do I have to re download them and pay again?

The cloud basically means it's a song that you purchased on iTunes but it has not been downloaded to your iPhone. You can download it again by tapping the cloud and then it will be stored on your device instead of being streamed from the internet