Mr. Gnome, courtesy. Post-grunge from Mr. Gnome, electronic disco from LP Giobbi and Mascolo, garage rock by Peel Dream Magazine and Genevieve Stokes, softer alt-rock by Skylar Gudasz and folky storytelling by Angie McMahon. Mr. Gnome, “Fader” — Mr. Gnome uses shredding guitar riffs and a heavy beat on…