George Harrison had a long relationship with Srila Prabhupada and his Hare Krishna movement. Very early George became a devotee and used his money for Krisahna by, for example, paying the full cost of printing Srila Prabhupada's, Krsna, The Supreme Personality of Godhead and by purchasing Bhaktivedanta Manor, ISKCON's headquarters in England.
George also sang about Krishna in his music. The most famous George Harrison Krishna song is, of course, "My Sweet Lord," but many of George's other songs are about Krishna also.
In the 1990's ISKCON had their first big reunion of the desciples of Srila Prabhupada at Bhaktivedanta Manor, the property donated to ISKCON by George, so naturally George attended.
We have just discovered new archival footage of George Harrison leading a kirtan and chanting Hare Krishna at that Prabhupada Festival and here it is.