Economy in Song Lyrics

How can song lyrics be economical? I write about three types:

1. Songs with expressions repeatedly peppered throughout
2. Instrumentals with the song title in it, frequently with few or no additional words
3. Songs that have one verse, repeated one or more times

Read the entire article at http://whilldtkwriter.blogspot.com/2013/12/economy-in-song-lyrics.html and comment there, please.