Indian Classical Music is all about ragas. A raga portrays a mood, a sentiment, expressed through a microtonal scale. There are a number of ragas, each with its own mood and its own corresponding microtonal scale that is based on the natural harmonic series – the natural law of vibrations.
Today, Indian Classical music is influenced by a foreign tonal system that is not based on the natural harmonic series. This is the Western tonal system that has had a big influence on Indian Classical music. Many Indian Classical musicians, nowadays, make use of Western instruments such as guitar and drums.
Most Western audiences find Indian Classical music to be quite exotic. Two major reasons are the differences between the two traditions in tuning and scales.
The subtle differences
Let’s straightaway delve into the differences between these two vast genres of music to get a better idea:
Indian Classical Music (ICM) is primarily homophonic, which means that it focuses on creating melodies using a sequence of notes, whereas Western Classical Music (WCM) is to an extent polyphonic, which means multiple notes are played/sung together, where the counterpoint, harmony, and texture created using multiple voices is very important.

WCM is composed, whereas ICM is improvised. WCM compositions are formally written using Staff Notation, and performers usually follow that. But in the case of ICM, the Teacher-Student tradition of learning leads to each performance being an improvisation.