This “Hindustani slide” instrument originally from northern India, is a blend of four Indian instruments: Sitar, Veena, Sarod and Violin. This guitar is traditionally built by a luthier from Calcutta (India). It has twenty-two strings. It has two “chikary” strings, four strings that manage the melody, two accompaniment strings called “Droms” and twelve sympathetic strings called “Tarab”. The Hindustani guitar is played on the surface with the help of thimbles and a metal slide bar (just like the Hawaiian guitar). It is an excellent instrument for playing both traditional Indian music and that of other oriental traditions.
Indian classical music is an ancient style that uses a complex system of “Raga” (melodic parts) and “Talas” (rhythmic parts). Indian classical music is very connected to spirituality and other topics usually connected to it. One of the ways to classify “Ragas” is the time of day or the desired sensation. Inside each Raga there are notes to avoid (so as not to spoil the feeling you want to achieve) and important notes to dwell on. Indian music would be a huge subject to deal with, however these short phrases I hope will give you an idea, albeit a very generic one.
This type of guitar is very similar to the one known as a classical guitar. Although their differences are apparently not noticeable, in fact different qualities of wood are used to build them. The sounds of the classical guitar are generally darker, while in the flamenco they are brighter.