I start with the fact that a Luthier called Antonio de Torres built a cardboard guitar with only the top being solid wood. People enjoyed its sound and were amazed. Others tried the same experiment with conclusive results. Back and sides is less important than the top soundboard. There is "high...
So you have two same acoustic guitars with solid top soundboard. One has laminated (plywood) back and sides, the other has solid wood back and sides. Everything else is the same : wood species, construction, weight and measurements. Both guitars were made on a Thursday when the sun was at its...
I am not. The Harmony guitar is not the only guitar ever recorded. In order to learn you need to practice with the same tonal characteristics that is present on the recording. If your instrument sounds bluesy you won't learn/play flamenco. You need an instrument that sounds right for the purpose...