Sad to hear of the death of singer Whitney Houston. I must admit that I don't know much more about her other than that she had a stormy life due to drug use and other mistakes but I sure enjoyed her singing.
I hope this is not an inappropriate time 'n' place to say this but something has always bothered me a bit about tributes to singers…and I guess we're about to see and hear many for Ms. Houston. To me, a tribute honors the person's work. I don't see how that is done when someone else sings the songs for which that singer was known.
If Whitney Houston had written the songs in question, that would be a performance of her work. If someone else comes out and sings "The Greatest Love of All," that's kind of offering a Whitney Houston presentation without any Whitney Houston in it. Imagine if when Rex Harrison died, someone came out and said, "To honor the fine work Mr. Harrison did, I will now play Henry Higgins in My Fair Lady."
Maybe this is trivial but I hope that when people honor her memory, it's done by presenting her work, not by proving someone else can sing the same songs well.