MayamalavaGowla

This auspicious raga evokes shāntha(peace) rasa and pathos. It creates a soothing effect. Suitable to sing at all times, particularly, the first yAMam (dawn). It is commonly used for beginners lessons such as Sarali Varises, etc. Since it eschews vivadi swaras (relatively discordant notes), has a uniform distance between swara sthānas (relative position of notes) and has symmetry, they are easier to learn. It is an ancient rāgam and has been around for a long time.

It is a Sampoorna raga. Also, it is a sarva swara gamaka varika rakthi rāga. It has a large number of janya ragas (derived scales) assigned to it. This rāgam corresponds to Bhairav in Hindustani music.

It is also defined as a mūrcana kāraka méLa since it can be used for Graha bedham on madhyamam and rishabham to result in Simhendramadhyamam and Rasikapriya respectively. Graha bedham is the step taken in keeping the relative note frequencies same, while shifting the Sruti (or drone) to another note in the rāgam. For further details and an illustration refer Graha bedham on Māyamālavagowla.

Janya ragams

Mayamalavagowla has quite a few janya ragams associated with it, of which Bowli, Jaganmohini, Gowla, Gowlipantu, Lalita, Nadanamakriya, Revagupti, Saveri and Malahari are quite well known. 

Source : wikipedia