Morning has Broken is a religious hymn predating Cat/Yusefs conversion to Islam.  Written by author Eleanor Farjeon and set to a traditional Gaelic tune Bunessan.  The song has been covered as wide a variety of singers as Art Garfunkel (a Jew) and Steven Curtis Chapman (a Christian Musician)  but by far the best is Cat Stevens (now known by his Islamic name Yusef).  His mastery of the guitar and the beauty of his voice make the song what it is.  Cat's version originally off the Album Teaser and th Firecat.