Could you identify the talent behind tonight’s 30 Rock original song?

Scroll down for clues as to the identity of the singer who satirically sang while Alec Baldwin, Selma Hayek and the old man went out on the town.

1. He was discovered while performing at a wedding
2. He’s Canadian
3. He dated British actress Emily Blunt for 3 years
4. He’s famous for singing jazz and American standards

Find the answer in the Comments section