How to delete all of the music on my iPhone 4s but not on iTunes?

With the new iOS7, I can't delete songs off of my phone they just aren't downloaded and they will have to load every time I play them. Along with that, I can't delete or un-download all of them at once (to do that, I have to "delete" each one singularly). The reasoning behind this is that I use a different app for music now and because I can't delete the music app, it takes up about 5.6 GB on my phone and I'm running out of space. A lot of it is music that isn't even mine and now it gets to the point where I can't even take pictures because the storage space is gone. Please help. All I want to do is delete the music app in general or completely delete all of the music in that app.

You can delete songs from your phone. Go to your music list and slide to the left on the song and tap delete