There's an old story about Lennon & McCartney hearing about guitar player in a band in another town who played a B7th chord... They hopped on a bus & rode to go see it.
The Beatles played for hour long sets while in Germany playing a wide variety of songs.
By the time they "became famous" they had an extensive knowledge of chord progressions in their head. It more than likely became almost intuitive that they knew what chord sounds they wanted in songs and where to use them.
That knowledge combined with their song writing skills became amazing.
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2003 Froggy Bottom H-12 Deluxe
2019 Cordoba C-12 Cedar
2016 Godin acoustic archtop
2011 Godin Jazz model archtop
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