The Star Wars soundtrack was composed and conducted by John Williams. This music also uses leitmotifs - listen out fo the different themes for each character; you know if Darth Vader is coming, if Yoda is about to appear to help someone or if Luke and Leia are going to wok together. John Williams also composed the music to the 1982 film E.T. the Extra-Terrestrial.
Gravity - There is no air in space to transmit vibrations so it is silent, unless you touch something and you allow the sound to travel through you. Composer Steven Price looked at really unusual and different ways to make sounds and layer them together. He and the director wanted it to sound different to usual film soundtracks so they did not use any percussion. They used sounds like: air conditioning units, rubbing objects across guitar strings, putting guitars under water, recording machines in a car factory.