
British band Nirvana (You can see it fitting into place now eh?) were the first to use this all the way through a track. Apparently The Beatles with 'Lucy in the Sky with Diamonds' and The Small Faces with 'Itchycoo Park' used the technique sporadically.

I recently dug out an old Island Records sampler album called 'You Can All Join In' made in 1969. It featured most, if not all, of the artists on the Island roster that year; including Stevie Winwood with Traffic, Spooky Tooth, Fairport Convention and Jethro Tull. In addition were the aforementioned Nirvana with 'Rainbow Chaser' - a track that was my favourite on the album. They were formed in the summer of 1967 (probably in a purple haze) and made the kind of progressive, flowery music you would expect from a band that names their single 'Rainbow Chaser'. Their album 'The Story of Simon Simopath' has been described as the first narrative based concept album released.
So all you Nirvana (some US based alternative) fans coming here to find some obscure rarity may be disappointed. But download it anyway and expand your horizons.