They're pretty good live, considering this is much harder material to pull off than some other bands. But as mentioned before, they definitely tuned this down. And not all bands enhance vocals to fix pitch in the studio; some just use the old fashioned way of recording lots of takes. But on the studio version of this take its clear as day that they fixed the pitch on the vocals, as good a singer as Levine is I doubt he can sing this song in the original key.