I can't delete certain songs from iPhone ios 7.

1. Plug Phone into PC

2. Open Itunes

3. Once phone is recognized click on "iPhone" in the top right hand corner

4. In the new screen go to the last tab "On This Phone"

5. Make sure "Music" is highlighted on the left hand side.

6. You should see all the songs in your phone even the greyed out ones

7. Select all the songs in the box so that they are all highlighted dark grey

8. Once all the songs are selected simply right click and hit Delete

9. It will ask you to confirm that you want all songs removed from your phone click "Yes"

10. Once the songs are gone go to the bottom of the screen and click 'Sync'

11. Check your phone, it should say "No Content"

HOPE THIS HELPS!