Introduce the class to the music of India. They'll discover three main types of music Raga, Tala, and Kriti. Cultural context and a description of basic Indian instruments is also provided. 

This is a very interesting resource that could be a helpful tool in the right context. Learners discuss the appropriate speaking volume needed in given situations. They practice one-on-one discussions, class discussions, and responding...

This site contains links to articles that explain how musical instruments work, describes vocal mechanics, and the three main vocal groups.