This audio features Lama Zopa Rinpoche reciting the Maitreya mantra.
Chapter 4 of Universal Love: The Yoga Method of Buddha Maitreya shares the following story of Buddha Maitreya:
While practicing as a bodhisattva Maitreya specialized in the meditation on great love. He not only taught this path to others but also meditated upon it continuously himself, often stationing himself at the gate of a city and contemplating deeply on loving kindness. His meditation was so powerful that people passing by close enough to touch his feet would themselves receive the realization of great love. This greatly pleased the tathagatas of the ten directions, who rejoiced in his actions and predicted that in all his future lives as a bodhisattva and a buddha he would be known as “Love” [Skt: Maitreya; Tib: Jampa]. This is how he received his name.
Lama Zopa Rinpoche explains the benefits of reciting this Dharani:
For more information on Maitreya Buddha, check this article from Mandala Magazine.