With Mercury in Libra, the aesthetics of communication matter. They like words that sound harmonious and take care with their tone of voice. They can express themselves firmly and persuasively without giving up kindness, so they lead or influence without their instructions sounding like orders.
Shouting, dissonant sounds and loud, harsh music make them uncomfortable. Nor do they like feeling pressured to decide or to take sides: their wish to stay on good terms with everyone can slow down their choice.
In groups they tend to play a peacemaking role. They would rather leave a place than fight, but if they feel they must remain in a conflictive situation they may respond with sarcasm or bad temper.
How something is said matters to them as much as what is said. That attention can bring beauty to their words, though it can also lead them to express themselves in an overelaborate, vague or evasive way when they are trying to avoid discomfort.