A lama (not to be confused with a llama, an animal indigenous to South America!) is a Tibetan Buddhist monk who has achieved a particularly high level of spiritual development and is a teacher of the religion's doctrine.
Lamas are often believed to be the reincarnations of previous lamas or holy men, although not all lamas fall into this category.
The Dalai Lama is the leader of a particular sect of Tibetan Buddhists.
Listen to what is said to be a rare recording of the Dalai Lama chanting: