http://www.openculture.com/2020/05/how-strawberry-fields-forever-contains-the-craziest-edit-in-beatles-history.html

While the time spent on the song might seem extravagant, we should consider that these days bands can pluck the sounds they want, whatever they are, from pull-down menus, and splice anything together in a matter of minutes. In the mid-60s, Brian Jones, Brian Wilson, Jimi Hendrix, the Beatles and other studio pioneers dreamed up sounds no one had heard before, and brought together instrumentation that had never shared space in a mix. Producers and engineers like Martin had to invent the techniques to make those new sounds come together on tape. Learning the ins-and-outs of how Martin did it can give even the most die-hard Beatles fans renewed appreciation for songs as widely beloved as “Strawberry Fields Forever.”