NEW YORK (Standard&Poor's CreditWire) Nov. 16, 2000--Standard&Poor's today affirmed its triple-'B'-minus corporate credit and senior unsecured debt ratings of Liberty Media Corp. following the announcement by AT&T Corp. that it intends to spin off parent Liberty Media Group to the Liberty Media tracking stock shareholders, subject to receipt of a favorable tax ruling by the IRS. While the spin-off may lead to investments in certain areas that were precluded by FCC regulations, Standard&Poor's does not believe it will result in a meaningful change in financial policy. The spin-off of Liberty Media Group does not impact the rating of AT&T Corp. since Standard&Poor's had analytically separated Liberty in its review of AT&T. However,