CREATE TABLE table_38599 ("Call sign" TEXT, "Frequency MHz" FLOAT, "City of license" TEXT, "ERP W" FLOAT, "Class" TEXT, "FCC info" TEXT)

Frequency MHz of 93.7 has what class?
SELECT "Class" FROM table_38599 WHERE "Frequency MHz" = '93.7'
SELECT "Class" FROM "table_38599" WHERE "Frequency MHz" = '93.7'