Alhaiya Bilaval is a Hindustani classical raga. It is the most commonly performed raga of a large group of ragas that are mainly based on a scale more or less identical to the Western major scale. For this reason, that scale itself is known as the Bilaval Thaat. It is often simply referred to as Bilaval, although in the 17th century Alhaiya and Bilaval may have been separate ragas. Alhaiya Bilaval is a raga which M is the main key.