The last one is another sentimental favorite of mine. I had a chance to see Bobby McFerrin perform with the Pittsburgh Symphony Orchestra when I was in college and it was absolutely stunning. He performed a stunning version of the Bach-Gounod Ave Maria. He sang the Bach prelude and the principal cellist performed the Gounod Ave Maria. It was one of the most beautiful performances I've ever heard.
But of course, that is not the song for which he is most famous. Instead, his primary source of recognition out in the world is for today's song. In 1988, he graced us with a song that is simultaneously horrible and fantastic. The first a cappella song to reach number 1 on the Billboard 100, Don't Worry, Be Happy seems to be one of those songs that everyone has heard at some point.
Personally, I think it's incredibly fun and I love to dance around my living room singing it. Which I'm going to go do right now. Have a great day!