Religious dance at one of the many Vaishnava monasteries on the island Majuli.
To get an idea about the music and Vaishnava culture I put some links here, (these are not mine!!!)
http://www.youtube.com/watch?v=TTS6NhEtzEQ
http://www.youtube.com/watch?v=K78MVzexvAg

Assam is famous for Majuli, the world's largest river island. Majuli situated in the midst of river Brahmaputra, is the centre of Vaishnava culture.
The total area of Majuli has been steadily decreasing due to strong erosion of the river Brahmaputra. The area of the island has reduced from 2,82,165 acres in 1853 to less than 886 sq. kms today.
There are over fifteen Vaishnava monasteries or satras on Majuli. The major satras are Kamalabari, Natun Kamalabari, Auniati, Garmur, Samoguri, Dakhinpat and Bengenaati. These satras are regarded as the main centres for Assamese art, music, dance, drama, handicrafts, literature and religion etc.