Why does iOS 7 show me songs on my iPhone that I've deleted?

So I got the new iOS 7 update for my iPhone 4, and aside from the fact that I'm not sure whether I like it or not, (though I'm sure I'll get used to it somehow) I noticed that on my music for some reason, its coming up with songs that I've deleted, and I know I have deleted these songs, yet they keep showing up with a download symbol next to them, and I can still listen to them, its bizarre, does anybody have any idea as to why this is? I know iOS 7 has only just came out but I'm hoping someone does know a little bit about it in depth to give a good enough answer!

Because streaming from your cloud storage has now been enabled, so with sufficient internet strength you can stream your music without downloading them.