I bought Hey There Delilah from iTunes, and I got the version from All That We Needed. Every time I hear it on the radio, there's violins (or some orchestral string instrument) in the background, but not in the version I bought. Is the song only like that on the HTD EP, or did Plain White T's re-record it for radio, or what?

I know that the version that is currently being played on the radio is from the CD Every Second Counts, which I think was re-recorded from the one that was All that We Needed.