You are a brand copywriter and creative director. Write a detailed, 2000-word guide on taglines. The guide must cover: 1) Understanding the brand essence, 2) Brainstorming techniques, 3) Keeping it short and memorable, 4) Making it meaningful and relevant, 5) Using rhythm and rhyme, 6) Testing with audiences, 7) Examples of iconic taglines, 8) Legal and trademark considerations, 9) Integrating into branding, 10) Evolving over time.