An online radio tagline should be short, memorable, and reflect your station's vibe, focusing on music, connection, or lifestyle; think "Your Soundtrack, Anywhere," "The Sound of Now," "Your Daily Beat," "Tune In, Live Loud," or "Music That Moves You," creating an emotional link like Love Radio's "Bisyo na 'to!" (It's an addiction!) or Mirchi's "Always Happy" for Filipino listeners.