Tolkien's reaction and knowledge of Led Zeppelin using references to LOTR

Question

The songs "The Battle Of Evermore" and "Ramble On" by Led Zeppelin have references to Lord Of the Rings.

The Battle Of Evermore

The pain of war cannot exceed the woe of aftermath,
The drums will shake the castle wall,
The ring wraiths ride in black, ride on.

Ramble On

T'was in the darkest depths of Mordor, I met a girl so fair.
But Gollum, and the evil one crept up and slipped away with her, her, her....yeah.

I was reading this article

“In addition,” Tolkien wrote, “in a house three doors away dwells a member of Group. On days when it falls to his turn to have a practice session the noise is a group of young men who are evidently aiming to turn themselves into a Beatle indescribable.”

I understand he had reasons for not liking Beatles, my question is how did Tolkien react to the references to LOTR in work of Led Zeppelin, was he even aware of the band?

Answer 1

As suggested by a user on reddit, Tolkien had an interest in inspiring people to create illustrations or music from his work (as long as it consisted of a proper reading of the work).

Tolkien had an interest in inspiring people to create other works of art, however had minimal interest for music, especially the kind of the early 70s (as paraphrased in the article above).

You certainly have my permission to compose any work that you wished based on The Hobbit . . . . As an author I am honoured to hear that I have inspired a composer.
_{The Letters of J. R. R.Tolkien: Letter 260}

As another user suggested in the same thread. Due to the time in Tolkien's life in which they wrote the songs ('68 - '71), and Tolkien's "lack of" interest in music, it is unlikely he was aware of Led Zeppelin. Furthermore, there is no mention in any letter or notes of Tolkien's knowledge of Led Zeppelin or his opinion of their music specifically.