The 8-week strike by the musicians of the St. Louis Symphony Orchestra is apparently over. One day after the SLSO management played its trump card, winning a ruling from the National Labor Relations Board that declared the strike illegal on a paperwork technicality, the two sides returned to the bargaining table and hammered out a tentative agreement. Details of the deal will be unavailable until the musicians vote to ratify it, but it is believed to be a three-and-a-half year contract.