Harrison viewed "Wonderwall" at Twickenham Film Studios with Massot and was intrigued by the storyline. The film's premise concerns a lonely professor (played by Irish actor Jack MacGowran) and his increasing obsession with his female neighbour, a fashion model named Penny Lane (played by Jane Birkin), whose life he spies on via a hole in the wall separating their apartments. In the context of 1960s Swinging London, the contrast between their existences symbolised the division between traditional norms and the younger generation's progressive thinking. Harrison approached the project as an opportunity to further educate rock and pop audiences in aspects of Indian music. Having incorporated sitar, tambura, swarmandal, dilruba and tabla in his work with the Beatles, Harrison sought to include less well-known Indian musical instruments. Among these, the oboe-like shehnai, traditionally used in religious ceremonies, was an instrument that Harrison had enthused about after seeing Bismillah Khan perform at the Hollywood Bowl in August 1967. Also prominent on the soundtrack is the tar shehnai, a bow-played string instrument that is similar to an esraj. Other instrumentation introduced on "Wonderwall Music" includes the sarod, similar to a lute, and the santoor, a type of hammered dulcimer with up to 100 strings. Having used personnel from the Asian Music Circle in north London on his Beatles songs "Love You To" and "Within You Without You", in addition to his own sitar playing, Harrison decided to record part of the soundtrack in Bombay, the centre of India's film industry, in order to work with some of the country's best musicians.