Q: Cannot delete songs from iphone which was purchased in itunes...

I have a song that purchased in itunes. However, I cannot delete it from my iphone. Even, I deselect the SHOW ALL feature inside setting.

Step 1: choose the song from album in iphone

Step 2: Swipe from left to right to delete the song

Step 3: The song cannot be deleted

Step 4: Go to setting and deselect "Show All music"

Step 5: Go to song album, but still can find the songs. All the songs that I purchased, which can be deleted, were not shown any more. However, it still shows those songs I downloaded by itunes store. I cannot delete them and I believe those songs are stored into my phone. Only I cannot delete them...

Please help

Will