GURU - Master, teacher. The guru system of teaching music is an aural tradition that extends back in time in India to the very beginning of North Indian traditions.

A text summary of the clickable map above, meant for web-crawlers and other automatic tools:
Guru means master
Guru means teacher
Guru means master teacher
Guru has students
Guru is teacher of South Indian Music
Guru is teacher of North Indian Music
Guru extends back to beginning of South Indian Music
Guru extends back to beginning of North Indian Music
Guru teaches oral tradition
Guru exists in India