Billy Joel - "The Longest Time"

Sam Smith carved out a name for himself last year thanks to numerous hits including "Stay With Me."  What's unique about "Stay With Me" is that it features only his voice.  Sure it sounds like he's backed by a large choir, but it's actually layers and layers of his own vocals.  Another song that fits that same mold is Billy Joel's "The Longest Time".  This #1 hit from 1984 features Billy as lead vocal accompanied by Billy Joel on background vocals.  Not bad for an artist whose music I've never particularly enjoyed.