Introduction.- How the war changed audio.- The V record label for US troops.- Stereo sound, multi-channel sound, film sound and more.- The physics of sound.- The advent of tape and moving coil microphones.- The development of microphone techniques.- Multi-channel Tape recorders.- The advent of the Big Studios.- The record business.- The Maverick producers and freelance engineers.- The big time with 24 track everywhere and heaps of signal processing.- How the technology changed the music.- Classical music recording is effectively broken by the technology.- Digital arrives, but something is not right.- A to D and D to A convertors and compressors in the digital domain.- High resolution Digital recording and re-sampling.- Lossless compression.- The revolution in playback technology.- The social revolution in consumed music.- The change in musicians.- How to do things properly.- The use of Digital Audio Workstations and the impact on music.- Why recordings sound worse now than they did in the 50s and 60s.- Music and Civilisation and why it is important.- Where is the future archive for serious music being produced now.- Are advances in technology always good.- Teaching Audio Engineers.- The future.- Conclusion.