Judy Garland and Barbra Streisand's duet of "Get Happy/Happy Days Are Here Again" is one of the great performances of the '60s. It's Judy at her gurgliest and Barbra at her bubbliest, and together they make a weirdly perfect team. 

Well, now they're both back in the form of singer Christina Bianco, who imitates both voices flawlessly. 

For comparison's sake, here's the original. Still wild.