George Michael & Aretha Franklin - "I Knew You Were Waiting (For Me)"

Before Tony Bennett and Lady Gaga, there was George Michael and Aretha Franklin: one emrging pop artist coupled with an established musical legend performing a duet together.  It likely led to years of fans at George Michael concerts wondering aloud if Aretha would show up to perform the duet to "I Knew You Were Waiting (For Me)".