Reading music in a Kindle? Does it work?

I had this question before, and decided to explore the possibility, which result in the creation of this website.
Yes, it is possible, and Kindle, Kobo, and I believe many other e-readers and tablets can be used especially for vocal music, as you can hold the device in your hand and freely sing. I don't think it would be so great to put it in front of a piano, or on a stand while playing your favorite instrument.
Just my opinion.