Melodic Difficulties
Or you may run into the following problem. The words are perfect. The meter is perfect. The song is three minutes and twelve seconds of perfection. It just sounds a little weird in places and doesn't blow you away in others. You thought it would work itself out if you just sang it for a week or two. That didn't happen. It's time to sit down and fix the problem.
Differentiating Parts of a SongIf the melody is good but it just doesn't go “bang” when it hits the chorus, there are a number of ways to fix this problem. First, look at the overall melodic range of the song. Is it too narrow? If so, try moving the chorus melody up a third or the verse melody to a fifth harmony in the octave below the melody. You might have to make some adjustments, but it's a starting point.
In a song with very small melodic range, modulating the key can be a way to differentiate sections. This is especially true in songs with sections that repeat back-to-back. For a great example of multiple modulations, listen to the Tommy Roe song “Dizzy.”
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What if the melodies of two adjoining sections are so different that they don't seem to connect? Sometimes this can be a tessitura problem. Look at where the notes are in the end of the first section. Are they more than half an octave away from the notes that begin the next section? If so, you can try changing the melody of the last line of the first section to “walk up” into the next section. Alternately, you might try starting the first line of the second section lower and “walking up” from there. Sometimes a combination of these two approaches can work.
If that doesn't do it, you might consider writing a two-line lift that provides a buffer zone. A lift usually has elements of the melody and meter of both sections. Sometimes, though, it will be totally different from one or both sections. The important thing is for the lift to create a workable musical connection to the sections on either side of it to help make the transition work. Of course, it'll probably need lyrics and it might make your song too long, so make sure you have extra time and something to say.

