What happens if you delete music on your iPhone?

Okay so, I had an iTunes gift card and I only have like 2 dollars left on it and I want to know if when you delete a song will it put the money you spent on that song onto your gift card or nothing happens you just delete a song and that's it? I really need help so if you answer that would be great. Please and Thank you.

You bought the songs with your iTunes account right? Even using the card, it should still be the same thing so it's safe to delete because you bought it with the same account, so since you already bought it you don't have to anymore

I think it won't put any money to that but you will still have the files on your pc in case you change your mind as long as you synced it recently.