I went scouting for birthdays today and found that Mikhail Baryshnikov is celebrating number 60. I lit up; I just knew there would be good stuff of Misha kicking around YouTube. And boy, was I right.
In 1969, a good five years before he defected, he danced a little Don Quixote.
Look at this clip from him in Giselle in 1977. The fluidity, the air he catches - wow.
Finally, his duet in 1985's White Nights with Gregory Hines. I recommend turning the volume off so you can enjoy this without listening to warmed-over "Danger Zone" type music.