For popular songs:
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I simply concentrated my efforts on a catchy chorus; so the words and music were constantly changing until the hook was sharp enough. The title influenced the chorus words greatly. pop choruses are normally upbeat, so to keep the mood of the listener upbeat, I kept the topic positive for a feel good factor. Then hopefully the listener would be waiting for the chorus bit. The verses, I made downbeat. And the mood was reflected as negative in the words. The final verse is all important: it has to be upbeat to bring the listener totally out of the dulldrums. The majority of pop listeners want to feel good I suppose.
As an example:
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Verse 1: "He's a cheating bastard"
Chorus: "But I feel really good, la, la, la"
Verse 2: "He picks his arse in bed and it niffs"
Chorus: "But I feel really good now he's gone, la, la, la"
Verse 3: "Here's how much better off I am, and why I feel good"
Chorus: "But I feel really good, la, la, la" ... and fade out