Is there a difference in the sound of LS-60 - LS-75? I see the only difference (except for the LS-75S, which has different pickups) in those guitars is the top of the body. LS-60 has a maple top, LS-65 has a maple2pcs top (what is that, actually?), LS-70F has a flamed sycamore laminated top and the LS75Q has a quilted maple laminated top. So... I'd guess there is some sound difference, but how much, and what sort of difference?