[jojobas]

>What's amazing is that Indian classical music has no key.

That's pretty much the same as hitchhikers tuning their guitars by ear with no perfect pitch skill. Anything within a couple of steps is good enough.

What fascinates me is that they are ok with staying in the same chord for the entire repertoire, that some perceptions (i.e. minor scales/chords are "sad" while major ones are "happy") seem to be universal.