The nature of the raga kalyani is something unique. It has a mood which brings in happiness when I sing. Also, the nature of the raga is such that it creates a mood
for singing other ragas. It is the 65th melakarta. It was called "santha kalyani" in the old scheme and "mechakalyani". in the new scheme. The alapanai typically starts in "pa" or "ga". Janta swaras and Daatu swaras are commonly used in the raga kalyani.
Kalyani is orginally a Middle Eastern scale and became popular in
Carnatic Music in the 18th and 19th centuries.