Simplify the following text for a Grade 11 native English-speaking person.
Original: `` Within You Without You '' features only Harrison and a group of uncredited Indian musicians , although producer George Martin arranged the string section , and Harrison and assistant Neil Aspinall played the tambura .
Simplified: The basic tracks for `` Within You Without You '' featured only Harrison and a group of uncredited Indian musicians . Producer George Martin then arranged a string section , and Harrison and assistant Neil Aspinall overdubbed the tambura .