AHI VAMOSAt long last, Gustavo Cerati returned to straightforward guitar rock on Ah? Vamos, following an extended run of fairly experimental albums that interwove electronic and orchestral flourishes into the fabric of the Argentine rock legend's guitar driven style. If you've followed Cerati's erratic solo career, not to mention his latter day efforts with his longtime band, Soda Stereo, it's difficult to view Ah? Vamos as anything except a back to basics