Today: "Open Arms" by Journey.
One of the first BIG power ballads. Prior to this song, Journey was a hard-rockin' band with a predominantly male audience. Following this collaborative effort between singer Steve Perry and keyboardist Jonathan Caine (I think), the audience demographic changed virtually overnight, and Journey was stuck with a soft-rock label. Of course, the band didn't do much to dispel this preconceived notion with pushing out a slew of power ballads in the followingyears, but that's another story.
Steve Perry was a great singer though, as this live clip is a testament to.