If I Had a Hammer ... A film about computers in the music industry . Narrated by Lesley Judd. Few rock and pop records are made today without the help of sophisticated computer-based synthesisers. They can reproduce the sound of virtually any instrument and replay strings of notes more accurately than session musicians. This film traces their development from the 19th-century Telharmonium to the Fairlight Computer Musical Instrument. 'It doesn't make you a better carpenter because you can bash in nails with your fist,' says music producer MARTIN RUSHENT. 'The smart guy uses a hammer.'