public void TestAFrequency()
        {
            MusicNote A = new MusicNote(Chromatic.A);

            Assert.AreEqual(440, A.Frequency());
        }
        public void TestCsFrequency()
        {
            MusicNote Cs = new MusicNote(Chromatic.Cs);

            Assert.AreEqual(554.37, Cs.Frequency());
        }