mutation {
  addSong(title: "blabla", artist: "bla-bla-bla", genre: "34d34vw34b545nnnn78m7", year: "2018", duration: 222, file: "3d2d23d3d32.mp3", rate: 100) {
    title
    artist
    genre
    year
    duration
    file
    rate
  }
}

"message": "songs validation failed: bitRate: Path `bitRate` is required., size: Path `size` is required., duration: Path `duration` is required., year: Path `year` is required., artist: Path `artist` is required., title: Path `title` is required.",

    addSong (title: String! artist: String!, genre: ID!, year: String!, duration: Int!, file: String! rate: Int!): Song

type Song {
    id: ID!
    title: String!
    artist: String!
    year: String!
    genre: String!
    duration: Int!
    #size: Int
    #bitRate: Int
    file: String!
    rate: Int!
    #singers: [Singer!]!
    lyrics: String
  }