I love "I Knew You Were Waiting," it's one of my favorite upbeat duets. Aretha is one of my all time favorite artists (along with Prince, Marvin Gaye, Madonna, Beyonce, Rick James, and Teena Marie). I also love George Michael's voice and many of his songs. As for a dream collabo, I know this is not exactly across genres (more like contemporary vs. Old school R&B) but Jeffrey Osborne (another great vocalist) recently stated that he would love to work with Beyonce. It would be great if those two could do a collabo! Actually Prince and Beyonce would be even more of a dream collabo for me. So many great vocalist have passed away but among the living it would also be great if Aretha and Elton John did a duet and Barbara Streisand and any soul singer like Michael McDonald, Jeffrey Osborne or James Ingram.