This article was published in Scientific American’s former blog network and reflects the views of the author, not necessarily those of Scientific American
Didn't mean to put post two CSN(Y) jams in a row, but apparently this has been a CSN weekend.
Video of Helplessly Hoping from their 2000 tour:
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And Ohio, from the Deja Vu album:
Finally, Graham Nash and David Crosby performing Guinnevere on BBC in 1970: