Thanks for uploading this unforgettable scene with the majestic song, there´s a channel Alucard here on Youtubet which has not only this wonder in full but also all the other tracks of Mr. Bakshi´s LOTR´s soundtack!

This lament for Gandalf borrows from Gustav Holst's "Jupiter The Bringer of Jollity"

Tune apparently swiped from Gustav Holst's "Jupiter". But so was many an "action news" soundtrack.