The whole LP The Four Vedas is also available at Archive.org, as Rocco Cestola kindly informed me. The link is:

https://archive.org/details/lp_the-four-vedas-the-oral-traditions-of-hymn_various/disc1/02.01.+Samaveda+(Opening+Hymn).mp3

I see that this one and the Danielou one there both came from the Boston Public Library. Thank you to Rocco and thank you to them.

Best regards,

David Reigle
Colorado, U.S.A.