five hundred thousand dollars
because its his favourite song ever made in the world except his own songs.
The following site provide the lyrics for the Cat Stevens song Morning has Broken: Sing365, Song Meanings and Lyricsfreak. YouTube also provides the lyrics as well as a video.
As of May 2014, Cat Steven is not blind. Cat Steven is a well known award winning musician. He now goes by the name Yusuf Islam.
Led Zeppelin did it, and no, Cat Stevens did not cover it to my knowledge.