Repeating a short rhythmic pattern gives the listener a sense of familiarity. This makes the song instantly more memorable.

The book is not just theoretical; it includes extensive analysis of well-known hit songs, illustrating how successful songwriters utilize these principles to create hooks. Finding "Melody in Songwriting" (PDF vs. Physical)

The book is a Berklee Guide published by Hal Leonard.

You can find the paperback or Kindle version on Amazon.

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Notes that directly match the underlying harmony for a strong, clear sound.