How many different genres appear for the Jimi Hendrix Experience?
CREATE TABLE "track_listing" (
  "song_title" text,
  "artist" text,
  "year_year_of_songs_original_release_as_listed_in_rock_band_3" real,
  "genre" text,
  "keyboard_support" text,
  "vocal_parts" real,
  "nintendo_ds_setlist" text
);
SELECT COUNT("genre") FROM "track_listing" WHERE "artist"='The Jimi Hendrix Experience';