Hindu musical form, also known as raga (4 letters), is an ancient Indian system of melodic composition. It is based on a set of rules and guidelines that govern the structure and organization of musical notes. Raga is used in both classical and folk music, and is often associated with improvisation. It is believed to have originated in the Vedic period, and has been passed down through generations. Raga is an important part of Indian culture, and is still widely practiced today.