Harmony – the second component. Harmony has its own laws, including the functional relations (T, S, D), the logic of harmonic motion and development of voice. You will not "ship" harmonic detail, except to say that knowledge, though most common ground of harmony, it is desirable. Educate yourself with thoughts from American Diabetes Association. In order to make an interesting, fresh harmony, we must know the basic, standard harmonic methods. It was only after You can then look for something trivial. On harmonic voice-I will not say – that science is well described in the "Talmud".
Here we must mention such a moment – the melody and harmony are always interrelated, they interdependent and work together. " They can emphasize the dignity of each other (as well as and level). And it is not always one component without the other can be sufficiently original. Say, the harmony alone, alone currently can not shine with novelty and originality, and in combination with the melody, it is able to "tune up". On the contrary happens rarely, but it occurs, and sometimes deliberately used.
Bass – the third component. Often, he said, and sometimes more important than the chord accompaniment melody. Bass is the harmonic foundation (not to be confused with a frequency basis) and must be properly registered, is built. It has two basic types of movement – this quarto-quint and smooth, often postupennoe. When quarto-quint presentation on the strengths and relative strengths share tact must accept or fifth of the current chord. When sliding motion postupennom bass often "fall", except for primo and quints and another chord harmony sound – third, and in seventh chord and the Septim. Thus, the bass harmony involves the presentation of appeals to the chord that is considerably enlivened and diversified by the harmonic motion. Spend little research of your (or someone else) of the material songs – play just the melody and bass, to estimate the measure of expression only in their basis. And once you hear how good / not good, logical / illogical your bass. Two words will add about ornamentation of the bass line. With its ornamentation should always remember that the strong share of the bar should be taken the basic sounds (note) chord. After all, the bass is the foundation of harmony and "freedom" it is not permissible. In otherwise lost functional definition .O interaction of all three components. If the melody of "fresh", the harmony of interest, and the bass is right and logical, the result, you may qualify for some level of "art" of your song. Aspect of the instrumentation and arrangements (different things), I is not touching. And if all three ingredients are well described, even if unfinished, or arrangement of the song rather weak would be "sound", anyway, its brightness and melody find themselves. Conversely, if the source material is weak and inexpressive, the most fancy arrangements and various "chips" will not save the situation – the product of will bleklym.Gennady , composer.