The song "Could Be So Happy" by Heartless Bastards is about the singer's desire to change herself for the better. She realizes that she has the power to be happy, funny, and sweet if she just stops being sad, a drag, and sour. She decides to take control of her life and see what tomorrow brings, making it to the midnight train and exploring the world outside. The singer goes on an odyssey through concrete and steel, running over hills and refusing to stand still. She longs to be out in the sweet unknown and is determined to make it happen. The lyrics suggest that the singer has been holding herself back and is now ready to break free from her old ways and embrace a new, happier life. Overall, "Could Be So Happy" is a song about self-improvement and the desire for change. The singer recognizes that change is within her power and is determined to make the most of her life. The song is a call to action, encouraging listeners to take control of their own lives and strive for happiness and fulfillment.