Assume, just for a mind bending minute, that Islam didn’t get as far as India, that they did an about turn, both the marauders and mystics alike, from the Hindukush. What would India be like then? The short answer to that question is - abysmal.
What would we have missed out on? The first thing that comes to mind is no Amir Khusrow, so no ghazals, no sitar. Indian music, both classical and light, particularly the North Indian stuff would sound completely different, a much paler version of itself. But hang on, not just Indian music. Fast forward seven centuries and take a shufti at the 1960s and that would sound quite dismal too. No sitar would mean no Ravi Shankar, no collaborations between George Harrison and the Indian maestro, no songs such as Norwegian Wood, which is on the list of 500 greatest songs of all time. Yup, one less on that list. Let that sink in while you take a listen.