A Friend found this beautiful image in an old book on World Music.

Starting from left:

1st guy is holding an Esraj. Looks like there are no sympathetics. And there seem to be sound holes on the top section of the sound-box as well. very interesting …

2nd guy’s instrument looks to be a Sitar.

3rd guy’s looks like a Veena – although I am not certain.

4th guy is holding a Taus. Doesnt look like the ones you see nowadays – but very cool nonetheless.