1973 trade advert of American jazz fusion band Mahavishnu Orchestra's album "Between Nothingness and Eternity" published on Billboard Magazines.
Columbia Records
<a rel="nofollow" class="external text" href="https://books.google.com/books?id=DQkEAAAAMBAJ&amp;pg=PA5&amp;dq=mahavishnu+orchestra+billboard&amp;hl=en&amp;sa=X&amp;ved=0ahUKEwiZmfGphe3aAhVlpVkKHb-6A8oQ6wEILjAB#v=onepage&amp;q=mahavishnu%20orchestra%20billboard&amp;f=false">Billboard Magazines, page 5, 15 December 1973</a>