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Harrison became interested in Indian classical music, bought a sitar and used it to record the song "Norwegian Wood (This Bird Has Flown)". In 1968, he went to India to take lessons from Shankar, some of which were captured on film. This led to Indian music being used by other musicians and popularised the raga rock trend. As the sitar and Indian music grew in popularity, groups such as the Rolling Stones, the Animals and the Byrds began using it in some of their songs. The influence even extended to blues musicians such as Michael Bloomfield, who created a raga-influenced improvisation number, "East-West" (Bloomfield scholars have cited its working title as "The Raga" when Bloomfield and his collaborator Nick Gravenites began to develop the idea) for the Butterfield Blues Band in 1966.