Hindōḷaṃ is a rāgam in Carnatic music (musical scale of South Indian classical music). It is an audava rāgam (or owdava rāgam, meaning pentatonic scale). It is a janya rāgam (derived scale), as it does not have all the seven swaras (musical notes). Hindolam is not the same as the Hindustani Hindol. The equivalent of Hindolam in Hindustani music is Malkauns  (or Malkosh ).
It is known to be a rāgam that is generally beautiful and soothing to listen to. Being symmetrical in its ascending and descending scales, it lends itself very well to improvisation and is therefore popular at concerts.
Structure and Lakshana
Hindōḷaṃ is a symmetric rāgam that does not contain rishabham and panchamam. It is a pentatonic scale (audava-audava rāgam  in Carnatic music classification - audava means 'of 5'). Since pentatonic scales can be found in other world music such as Chinese music, shades of Mohanam and Hindōḷaṃ can sometimes be traced in Chinese and east Asian music. Its ārohaṇa-avarohaṇa structure (ascending and descending scale) is as follows (see swaras in Carnatic music for details on below notation and terms):
Experts in Carnatic music hold differences of opinion on the janaka rāgams (rāgams of origin) that should be attributed to Hindolam. It is widely accepted that 20th melakarta, Natabhairavi is the parent rāgam of Hindolam, but some would like to associate it with 8th melakarta, Hanumatodi. It can be derived from both, by dropping the rishabham and panchamam.
Sāmajavara gamanā by the maestro Tyagaraja is the most popular composition in Hindolam. Mamavatu śri Sarasvati by Mysore Vasudevachar is another popular composition. Here are some more kritis composed in Hindolam.
- Gōvardhana Girīśam Smarāmi by Muthuswami Dikshitar in Sanskrit
- Sāma Gāna lole by G. N. Balasubramaniam
- Nambi kettavar evar by Papanasam Sivan
- Maa Ramanan by Papanasam Sivan
- Govardhana Giridhāri and Sāmajavara Gamanā by Tyagaraja in Telugu
- Padmanabha Pāhi by Swathi Thirunal
- Dēva Dēvaṃ Bhajē by Annamacharya in Telugu
- Koṃḍalalō Nelakonna by Annamacharya in Telugu
- Ramanakku Mannan Mudi by Arunachala Kavi
- Tillana (Dhim na naa tha dhirana) by Dr. Balamuralikrishna
This section covers the theoretical and scientific aspect of this rāgam.
Hindolam's notes when shifted using Graha bhedam, yields 4 other major pentatonic rāgams, namely, Mohanam, Shuddha Saveri, Udayaravichandrika (also known as Shuddha Dhanyasi) and Madhyamavati. Graha bhedam is the step taken in keeping the relative note frequencies same, while shifting the shadjam to the next note in the rāgam. For more details and illustration of this concept refer Graha bhedam on Mohanam.
- Saramati has an asymmetric scale, with the ascending scale of Natabhairavi, while the descending scale is same as Hindolam. Its ārohaṇa-avarohaṇa structure is S R2 G2 M1 P D1 N2 S : S N2 D1 M1 G2 S