It's not that I'm homesick for the place I left; it's more that I'm homesick for the place it used to be. It's long gone now, except for the barest traces, and there is no pretending otherwise.
The people who came before me might say the same about my era. There is a joke about Austin that it was always it's best just before you came. But maybe that goes for Texas as a whole.
All the same, that doesn't stop me from craving a Thundercloud sub every so often and missing the scent of mountain cedar and limestone dust.
Anyway, here is a good documentary about psychedelic music, via the Internet Archive.