The song has a unique sound, featuring a dual guitar solo by George Harrison played backwards, as well as an electronically compressed rhythm guitar track. The idea for the backwards solo was conceived after a tape operator accidentally threaded a tape into the machine the wrong way. The backwards guitar was written and performed by Harrison in a five hour late-night recording session with producer George Martin. To make the solo consistent with the rest of the song, Harrison had to practise the entire melody of his solo backwards so that when reversed and mixed in, it would fit the overall dreamlike mood of the rest of the song.