[INDOLOGY] Classical Indian musical theory

[Martin Gansten]

A professional Baroque violinist, not an Indologist and so not on this 
list, has asked me for introductions to classical Indian musical theory, 
including the concept of rāga, especially as found in Carnatic music. 
Both primary texts (in translation) and secondary sources are welcome, 
and the period corresponding to the Baroque (17th to 18th century) would 
be of special interest.

This question is entirely outside my field of knowledge, and I would 
appreciate any suggestions from knowledgeable colleagues. If there are 
particular recordings that might be helpful, and perhaps go with a 
particular text/book (by design or serendipity), that would be useful too.

Thanks in advance for any help,
Martin Gansten