DALLAS (Standard&Poor's CreditWire) Feb. 15, 2001-- Standard&Poor's today assigned its double-'A' rating to Nashville and Davidson County Metropolitan Government, Tenn.'s $277.98 million GO multipurpose improvement bonds series 2001A due Oct. 15, 2021, and $248.05 million GO refunding bonds series 2001B due Oct. 15, 2021. The bonds are scheduled to sell Feb. 20, 2001. The outlook is changed to positive from stable. In addition, Standard&Poor's affirmed its double-'A' rating and underlying rating (SPUR) on the metropolitan government's outstanding GO debt. The bonds are secured by the full faith and credit of the metropolitan government. The rating reflects: -- A diverse and expanding economic base, -- Above-average wealth and income levels, -- Low tax rates, --