CREATE TABLE table_35481 ("Call sign" TEXT, "Frequency MHz" TEXT, "City of license" TEXT, "ERP W" FLOAT, "FCC info" TEXT)

Which City of license has a Frequency MHz of 91.5 fm?
SELECT "City of license" FROM table_35481 WHERE "Frequency MHz" = '91.5 fm'
SELECT "City of license" FROM "table_35481" WHERE "Frequency MHz" = '91.5 fm'