How many power kw have a frequency of 93.7 mhz?
CREATE TABLE "table1_23915973_1" (
  "branding" text,
  "callsign" text,
  "frequency" text,
  "power_k_w" text,
  "coverage" text
);
SELECT COUNT("power_k_w") FROM "table1_23915973_1" WHERE "frequency"='93.7 MHz';