Listen to Mitwa, the famous song from Lagaan, paying attention to the tone of the plucked instrument in the first 60 seconds.
Listen to the beginning of another AR Rahman song, this time from the movie Indira (especially the portion beginning at 0:14). Listening to the rest of this brilliant song is an added bonus, but is beyond the scope of this exercise.
Pay heed to a song composed by Amit Trivedi from Dev D. The first 13 seconds would do:
Each of these songs has a distinctly different tune, but the similarity in the instrumentation is uncanny. Is it because of the instrument used?