Again this is my own view on Transcendental Meditation.
Transcendental Meditation involves a mantra or sound that is used throughout the meditation
In a group TM meditation is person chants e.g. the word AUM with different vibration, tone, energy and frequency, thus making the mantra echo and amplify. Each person is chanting this sound or mantra at their own pace and rhythm.
What I love about TM meditation is the energy it brings to each person, the bigger the group the more powerful the energy. You are not easily distracted by taught as the mind as something to keep it occupied a mantra or sound.
It amplifies the senses, body mind and soul.