The impossibility of adequately pointing out by words the specific examples of what I mean in certain songs makes it necessary for me to direct you back to your own piano. Run over a group of your favorites and see how many musical punches you can find that are not due directly to the theme. Pick out the catchy variations in a dozen songs—you may chance on one or two where the biggest punch is not in the theme. Of course you may trace it all back to the theme, but nevertheless it still stands out a distinct punch in the variation. If you can add this punch to your theme-punch, your song success is assured.
8. Use of Themes or Punches of Other Songs
When Sol P. Levy, the composer of "Memories," the "Dolly Dip Dances," and a score of better-class melodies, shared my office, one of our sources of amusement was seeking the original themes from which the popular songs were made. As Mr. Levy was arranging songs for nearly all the big publishers, we had plenty of material with which to play our favorite indoor sport. It was a rare song, indeed, whose musical parent we could not ferret out. Nearly all the successful popular songs frankly owned themes that were favorites of other days—some were favorites long "before the war."
Berlin's use of "Way down upon the Swanee River"—"played in ragtime"—for a musical punch in "Alexander's Ragtime Band," was not the first free use of a theme of an old favorite for a punch, but it was one of the first honestly frank uses. The way he took Mendelssohn's "Spring Song" and worked it into as daring a "rag" as he could achieve, is perhaps the most delightfully impudent, "here-see-what-I-can-do," spontaneously and honestly successful "lift" ever perpetrated. Berlin has "ragged" some of the most perfect themes of grand opera with wonderful success, but not always so openly. And other composers have done the same thing.
The usual method is to take some theme that is filled with memories and make it over into a theme that is just enough like the familiar theme to be haunting. This is the one secret or trick of the popular song trade that has been productive of more money than perhaps any other.
This lifting of themes is not plagiarism in the strict sense in which a solemn court of art-independence would judge it. Of course it is well within that federal law which makes the copyrightable part of any piece of music as wide open as a barn door, for you know you can with "legal honesty" steal the heart of any song, if you are "clever" enough, and want it. The average popular song writer who makes free use of another composer's melody, doubtless would defend his act with the argument that he is not writing "serious music," only melodies for the passing hour and therefore that he ought to be permitted the artistic license of weaving into his songs themes that are a part of the melodic life of the day. [1] But, although some song writers contend for the right of free use, they are usually the first to cry "stop thief" when another composer does the same thing to them. However, dismissing the ethics of this matter, right here there lies a warning, not of art or of law, but for your own success.
[1] An interesting article discussing the harm such tactics have done the popular song business is to be found over the signature of Will Rossiter in the New York Star for March 1, 1913.
Never lift a theme of another popular song. Never use a lifted theme of any song—unless you can improve on it. And even then never try to hide a theme in your melody as your own—follow Mr. Berlin's method, if you can, and weave it frankly into your music.
Now, to sum up all that has been said on the music of the popular song: While it is an advantage for one man to write both the words and music of a song, it is not absolutely essential; what is essential is that the words and music fit each other so perfectly that the thought of one is inseparable from the other. One octave is the range in which popular music should be written. Melodies should go up on open vowels in the lyrics. A "punch" should be put in the music wherever possible. Punch is sometimes secured by the trick of repetition in the chorus, as well as at the beginning and end. The theme may be and usually is the punch, but in the variations there may be punches not suggested by the theme. Themes, semi-classical, or even operatic, or punches of old favorites may be used—but not those of other popular songs—and then it is best to use them frankly.
To state all this in one concise sentence permit me to hazard the following: