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"If you use the method I often use to write lyrics, unrhymed lines almost write themselves sometimes. I begin by writing a plain english summary of the song. I work on the summary until I have a title. I never start writing lyrics before I have the song's title. The title needs to appear in the verses of AABA songs and in the chorus of ABAB songs (like Rokket's song). I can't write those parts until I have my title. If the song has a chorus (the B in ABAB), the summary will help me write the chorus.
But before I start writing the chorus I write in plain english what I want to say in each verse and the bridge (if the song has one). I make sure the verses have a logical flow and they support the summary and the title. If the song has a bridge, I write in plain english some new important information for the bridge section -- something that the song needs to say, but won't fit in the verses. The inclusion of a bridge will sometimes have an effect on what you want to say in the verses, especially if you want to reveal some important new fact in the bridge. When I am done, I will have at least a paragraph for each section (verses, chorus, bridge) of the song.
Once I have all that written down I begin with the first verse. Sometimes I use lines from my first verse description almost verbatum. I let the lines flow naturally and don't concern myself too much with line length or meter. Once I have a rough first verse, I work with it until all the words are singable and I don't feel any urges to use rhymes. When I am happy with the first verse, I work on the other verses (sometimes I jump to the chorus at this point). When I write the other verses I try to match closely (not perfectly) the line length and meter from the first verse. This will make it possible to sing each verse with the same melody -- an important part of making the song memorable.
When I write the chorus I make sure that it sounds different from the verses. Using unrhymed verses makes that part easy. The tight rhymed lines of the chorus naturally will be different from the free unrhymed verses. I make sure the chorus sumarizes the song well and the title appears at least once; twice or three times is better. The chorus may be the only part your listeners memorize, so it needs to sound good and be easily sung.
I usually write the bridge last. Sometimes I use rhymes here and sometimes I don't. If the bridge doesn't pull it's weight and make the song better, I drop it.
If the song is an AABA song (with a bridge and no chorus), the writing process is pretty much the same as above. I just don't write a chorus section. The verses are much more important in this song form. They have to hold your interest without leading up to a memorable chorus; and (as I said above) the title must appear in each verse. It should appear in the exact same position (same line) in at least two of the verses."