CREATE TABLE "artist" (
    "Artist_ID" int,
    "Artist" text,
    "Age" int,
    "Famous_Title" text,
    "Famous_Release_date" text,
    PRIMARY KEY ("Artist_ID")
)

CREATE TABLE "volume" (
    "Volume_ID" int,
    "Volume_Issue" text,
    "Issue_Date" text,
    "Weeks_on_Top" real,
    "Song" text,
    "Artist_ID" int,
    PRIMARY KEY ("Volume_ID"),
    FOREIGN KEY (`Artist_ID`) REFERENCES `artist`(`Artist_ID`)
)

CREATE TABLE "music_festival" (
    "ID" int,
    "Music_Festival" text,
    "Date_of_ceremony" text,
    "Category" text,
    "Volume" int,
    "Result" text,
    PRIMARY KEY (`ID`),
    FOREIGN KEY (`Volume`) REFERENCES `volume`(`Volume_ID`)
)
SELECT Category FROM music_festival GROUP BY Category HAVING COUNT(*)  >  1
Please show the categories of the music festivals with count more than 1.