Over 700 years old with a unique sound that highlights Indian music, the sitar has become Indias most popular musical instrument. There is a lot of debate over the origins of the sitar, however scholars believe that it may have originated from an ancient Persian instrument called setar. The sitar is popular in many forms of Indian music, from classics to folk songs and new age contemporary music. The instrument has been used in movies, commercials, in bands and has been explored even in the more avant garde world.
Here you can listen to sitar in Norah Jones song named Easy: https://www.youtube.com/watch?v=jguri1qOCY0
Here is as picture of a 19th century sitar:
A sitar can have 18 to as many as 21 strings, and several of those strings stretch over raised curved frets. The remaining strings are left to resonate with the strings that are being played. The sounds from these strings are used to set the mood for a raga. The frets are moveable and are used to fine tune the instrument. The wood that’s used to construct the sitar is typically teak, and the sound chamber is made from calabash gourd. The bridges are made of deer horn, ebony and sometimes camel bone, synthetic materials are also used.
Ravi Shankar and tabla player Alla Rakha brought the sounds of India to the west in the late 1950’s to early 1960’s. This introduction was the base for many more experimental musical collaborations with sitar and western instrumentation. The sitar was used in music with the legendary Beatles, and also the Rolling Stones featured sitar in their music. During this time elegant Indian sitar became very popular leading Ravi Shankar to name the trend “the great sitar explosion”. Now today, across the globe, many people are familiar with the beautiful serene sound of the sitar, even if they have never seen it in person.
Reference: https://en.wikipedia.org/wiki/Sitar