Anonymous is right about Rick's Organ at the beginning of "Echoes". It is very faint in the background, you need a Hi-Fi VCR in order to hear it and I am sure that I can hear it. He is also right the Floyd using solar energy for that show. If you look around the theatre at the beginning of the film, you'll notices solar panels. What these are used for I don't exactly know????

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"I mean they're Gonna Kill Ya, So like, if you give em a quick shh short, sharp, shock, they don't do it again, dig it..."