. >> reporter: giles martin is the son of george martin, the legendary beatles producer that took sgtnever been. did they know at the time that they had changed rock history? >> i'm not sure if it was deliberate, but they wanted to do different things all of the time. the conscious decision was we're already bored by what we're doing. it wasn't how can we change the face of popular music. >> 1967, the summer accept ws under one. >> paul gambaccini is a d.j. author and walking music encyclopedia. >> although most people praised it, richard goldstein panned it. >> reporter: hated it. >> diget it wrong? i think so. what i didn't pick up is where it was leading music. that decision to take music and blast all the framework that pop music had been encased in, like a very tight girdle, and just let it flow freely, was incredibly influential on the counter-culture andolt whole history of music. >> reporter: bring up a chord. nothing flowed more freely than the album's final chord. ♪ ♪ which giles martin has remixed, along with the rest of the album, and which, 50 years later-- surprise, surp