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Led Zeppelin covering Buffalo Springfield's For What it's Worth live in concert. Included on this video are two live performances of the cover. The first being during the Communication Breakdown medley as recorded on the famous bootleg "Live on Blueberry Hill", the second one comes from a much darker and creepier performance of the song recorded live at Seattle in March 21st 1975, both are some of my favorite live Led Zeppelin moments. BTW add &fmt=18 at the end of the URL to get High Quality Sound.
Also it's extremely cool when plant sings some lyrics from I Shot the Sheriff on the second version.