* Buddhist Monks: Many Buddhist monks chant in Pali, the language of the Buddhist scriptures. However, they might also use Sanskrit, Tibetan, Chinese, Japanese, or other languages depending on their tradition and location.
* Christian Monks: Christian monks sing in Latin, which was the liturgical language of the Catholic Church for centuries. However, many Christian monks now sing in their native languages as well.
* Hindu Monks: Hindu monks might chant in Sanskrit, the sacred language of Hinduism. However, they also use other languages like Hindi, Tamil, or Bengali depending on their tradition and location.
Therefore, the language monks sing in is varied and depends on their specific religious tradition and location.