You didn't ask, but I'll just add that an unconscious person in the end stage of a terminal disease will not experience any discomfort from the lack of food or water. Indeed, dehydration and hypoglycemia release natural endorphins that reduce sensations of pain or hunger.
The music to Somewhere over the Rainbow was written by Harold Arlen; the lyrics were written by Edgar Yipsel (Yip) Harburg. But Julie Garden sang it. Arlen and Harburg collaborated on all the songs featured in the movie, The Wizard of Oz. Over the Rainbow won Academy awards for them both.
Following the film's release in 1939, Over the Rainbow became Garland's signature song and she would perform it for the next thirty years, until her death in 1969. Garland performed the song without altering it, singing exactly as she did for the movie.