I'm a fan of I'm With Her. In fact, I have tickets for their concert in Cincinnati on July 11. Great harmonies, great musicianship, loads of fun from three songwriters with great voices. Check out this live performance
That's neither here nor there for today's video, however, as it's focused on the production of the vinyl for their first album. Initially the grooves are carved in a thin lacquer on an aluminum disk to make a master. The disk is then metallized with a thin coating of aluminum which is then copied as another metal disk to create a mother - another metal disk which is then used to make the actual vinyl records.
I'll admit that the general idea - make a positive to make a negative to make a whole bunch of positive copies - is fairly straight forward, but I've never seen the specific process for vinyl records.