The "Wonderwall" score was Harrison's first opportunity to compose extensively for a single project. He later described how he went about preparing the music: "I had a regular wind-up stopwatch and I watched the film to 'spot-in' the music with the watch. I wrote the timings down in my book, then I'd go to recording studio, make up a piece, record it." including "Within You Without You" and "Blue Jay Way", he composed mainly on keyboard instruments such as piano or organ, rather than guitar. In addition to the Indian pieces, Harrison wrote and arranged selections in Western musical styles. In some cases, these pieces were outlined to the musicians at the recording session by Harrison, on guitar, and they then improvised on his ideas. With other selections, he first made a demo, which the musicians followed. who had studied composition under Harrison's sitar teacher, Ravi Shankar. A classically trained pianist and musical arranger, Barham annotated some of the melodies that Harrison sang to him and transcribed them onto staves. He adds that their musical compatibility made Barham a natural choice over George Martin, the Beatles' producer and orchestral arranger.