This rendition of Ninnukori Mohana Raga varnam by L. Subramaniam is mind-boggling. It is played in 15 speeds with increasing frequencies and I had goose bumps when the 15th speed was being played....
http://www.youtube.com/watch?v=w4oOB8EOe5g
http://www.youtube.com/watch?v=w4oOB8EOe5g