The division of Indo-Iranian languages in the North and Dravidian languages in the South corresponds to the division of classical musical style into Hindustani (Northern) and Carnatic (Southern).
Please watch this video lecture as you scroll further down.
https://www.youtube.com/watch?v=jRF34RGnzoQ
All music is primarily vocal in character
As opposed to the elements of melody, harmony, and rhythm. Musics of the Indian subcontinent are constructed around râga (complex melody form) and tâla (complex rhythmic cycles). Together they serve as the basis for composition and improvisation.
Tala/tal—Rhythm Cycle
Elements of Tal
TEENTAL
CLAP, 2, 3, 4, CLAP, 2, 3, 4, WAVE, 2, 3, 4, CLAP, 2, 3, 4
CLAP, 2, 3, WAVE, 2, 3
KAHERVA TAL
CLAP, 2, 3, 4, WAVE, 2, 3, 4
RUPAK TAL
WAVE, 2, 3, CLAP, 2, CLAP, 2
Rāga development—in Hindustani Music
Performance of Indian classical music generally follow the same format.
First an introduction sets the mood, both in vocal and instrumental music.
Alāp—free rhythm exposition of rāga---can be long or very short.
In longer renditions of instrumental music you also have the following two sections.
Jor—introduction of pulse into instrumental alāp, with more elaborate melodic development (optional)
Jhala-fast pulse (optional) with rapid strumming of strings.
You then have compositions upon which the performer will improvise in the raga framework.
in instrumental music is called Gat-composition in the rāga set in a specific tāla.
Tora—improvisational episodes that alternate with the gat.
Gats can be in slow, medium, or fast tempos. In fast gats they can accelerate to a gat jhala
In vocal music the compositions are called bandish (literally, "closed" or "fixed") and as in instrumental music, progress from slow to fast compositions, although in abreviated performances a music may forego one or the other.
The following is an encapsulated performance of the raga called Jog, by the great sitar virtuoso, the late Pandit (Master) Ravi Shankar.
http://youtube.com/watch?v=-lcB48oQq6s
The parts are as follows