GALLERY: Montreal Guitar Show 2010 Joe CoffeyAndy EllisLiana PrudencioJuly 15, 2010The Metropolis' five slit-like soundports on its side differentiated it from other guitars at the show. Grellier used European spruce for its top and maple for its back and sides. gearwhats-newmontreal-guitar-show-10gear-galleriesonline-onlyGearGear Galleries