MuDBase/server/models/song.js

module.exports = (sequelize, DataTypes) => {
    var Song = sequelize.define('Song', {
      title: DataTypes.STRING,
    });
  
    Song.associate = function(models) {
      models.Song.belongsTo(models.Artist, {
          onDelete: "CASCADE"
      });
    };
  
    return Song;
  };