The 1970 event was by far the largest of these early festivals; indeed it was said at the time to be one of the largest human gatherings in the world, with estimates of over 600,000, surpassing the attendance at Woodstock. Included in the line-up of over fifty performers were Jimi Hendrix, Miles Davis, The Doors, The Who, Lighthouse, Ten Years After, Emerson, Lake & Palmer, Joni Mitchell, The Moody Blues, Melanie, Donovan, Gilberto Gil, Free, Chicago, Richie Havens, John Sebastian, Leonard Cohen, Jethro Tull, Taste (Irish band) and Tiny Tim. The unexpectedly high attendance levels led, in 1971, to Parliament adding a section to the Isle of Wight County Council Act 1971 preventing overnight open-air gatherings of more than 5,000 people on the island without a special licence from the council.