public Instrument next() {
        Random rand = new Random();
        switch(rand.nextInt(6)) {
        case 0:
            return new Wind();
        case 1:
            return new Percussion();
        case 2:
            return new Stringed();
        case 3:
            return new Brass();
        case 4:
            return new Woodwind();
        case 5:
            return new Instrument();
        default:
            return new Instrument();
        }
    }