Step 1: Concept
Under the janya raga classification system, ragas are divided into Upanga (strictly using parent notes) and Bhashanga (using a foreign note).
Step 2: Definition of Bhashanga Raga
A Bhashanga Raga is a janya raga that occasionally introduces one or two notes that do not belong to its parent Melakarta raga. This foreign note is called an Anya Swara.
Step 3: Key Characteristics
- The primary framework of the raga strictly follows the parent Melakarta notes (Swadhina Swara).
- However, to bring out the traditional, pleasing aesthetic identity of the raga, the anya swara is introduced in specific, designated melodic phrases.
Step 4: Examples
1. Bhairavi: Derived from the 20th Melakarta (Natabhairavi). Natabhairavi uses Suddha Dhaivatam ($D_1$). Bhairavi occasionally uses Chatusruti Dhaivatam ($D_2$) as an anya swara in its ascending phrases (e.g., $G_2 \ M_1 \ P \ D_2 \ N_2 \ S'$).
2. Kambhoji: Derived from the 28th Melakarta (Harikambhoji), which uses Kaisiki Nishadam ($N_2$). Kambhoji uses Kakali Nishadam ($N_3$) as an anya swara in specific phrases (like $S' \ N_3 \ P \ D_2 \ S'$).
3. Bilahari: Derived from the 29th Melakarta (Dheerasankarabharanam), which uses Kakali Nishadam ($N_3$). Bilahari uses Kaisiki Nishadam ($N_2$) as an anya swara in descending step-phrases.
Final Answer: A Bhashanga raga is a derived raga that occasionally incorporates one or more foreign notes (anya swaras) outside its parent Melakarta scale. Well-known examples include Bhairavi, Kambhoji, and Bilahari.