At some point everyone feels like they've got a bit of the Imposter Syndrome. Even when we're first riding a bike, we have to pretend we know what we're doing and we have to go through the motions to get the thing moving forward. The bike might wiggle and zig-zag and falter, but at some point we're going.
Musicians often have the same trajectory of going from covering their favorite artist's songs until they find their own unique voice and style.
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