Via Sullivan, scholar John Suiter discovered a recording of Allen Ginsberg reading "Howl" at Oregon's Reed College in 1956:
It’s also easy to forget that Allen Ginsberg’s generation-defining poem “Howl” was once almost a casualty of censorship. The most likely successor to Walt Whitman’s vision, Ginsberg’s oracular utterances did not sit well with U.S. Customs, who in 1957 tried to seize every copy of the British second printing. When that failed, police arrested the poem’s publisher, Lawrence Ferlinghetti, and he and Ginsberg’s “Howl” were put on trial for obscenity. Apparently, phrases like “cock and endless balls” did not sit well with the authorities. But the court vindicated them all.
The recording [linked above] sat dormant in Reed’s archives for over fifty years until scholar John Suiter rediscovered it in 2008. In it, Ginsberg reads his great prophetic work, not with the cadences of a street preacher or jazzman—both of which he had in his repertoire—but in an almost robotic monotone with an undertone of manic urgency. Ginsberg’s reading, before an intimate group of students in a dormitory lounge, took place only just before the first printing of the poem in the City Lights edition.
That's almost sixty years ago; the poet was 30. For what it's worth, I bought my copy at City Lights many years ago.