ROCK OF AGES (2LP)Long before they became The Band, these four Canadians and one southern rebel rocked the rooftops off Canada as The Hawks, Ronnie Hawkins's fierce back up band. Their non stop performing took them through nearly every bar in the region, and the group developed into a tightly wound rock unit. It is therefore interesting that, as The Band, the group was known more for its reluctance in the live arena than for its live prowess. This was in part due to