 Since these four chords are played as an ostinato, the band also uses a vi–IV–I–V, usually from the song "Save Tonight" to the song "Torn".The band plays the song in the key of D (E in the live performances on YouTube), so the progression they use is D–A–Bm–G (E, B, C#m, A on the live performances).Most of the songs have been transposed from their original keys.