Trinity

https://en.wikipedia.org/wiki/Trinity_of_Carnatic_music
http://www.vgovindan.info/

Interestingly, 

1. Saint Thyagaraja swamigal followed Sage Narada’s tradition, and 
2. Sri Muthuswami Deekshidar followed Lord Hanuman’s tradition.
3. Syama Sastri's followed Kamakshi Tradition son, the illustrious Subbaraya Sastri (1803–1862), had the unique privilege of learning under each of the trinity.

Tyagaraj

https://t8oo.blogspot.com/

Muthuswami

https://freeglobaluniversity.blogspot.com/search/label/72

Syama

http://01si.blogspot.com/search/label/ShyamaShastri

http://012p.blogspot.com/search/label/PersonalisedBhagavat

Tube
https://www.youtube.com/results?search_query=Trinity+of+Carnatic+music

Library
http://tamilelibrary.org/teli/tnmusic1.html

Heritage / Bhakti
http://www.heritagetown.org/smusician.html
http://haridasgiri.blogspot.com/ 

My Grandfather
http://carnaticclassicals.blogspot.in/

https://en.wikipedia.org/wiki/Thiruvarur

Tube

https://www.youtube.com/results?search_query=Thiruvarur

Slides

http://www.slideshare.net/search/slideshow?searchfrom=header&q=Thiruvarur