Final answer:
The underlined phrase 'Ring with the harmonies of Liberty' means that the voices should resound with the joyful and harmonious sounds of freedom.
Step-by-step explanation:
The underlined phrase in the passage 'Ring with the harmonies of Liberty' means that the voices should resound with the joyful and harmonious sounds of freedom. This phrase is a poetic way of expressing the idea that the voices should be united and strong, just like the ringing of bells or the sound of waves crashing on the shore.