I sometimes wonder what it would be like if another species had survived and developed alongside us. They would be humans but....not quite what we conceive of as human(basically our species). What would their culture have been like? Music, art, language, etc.

As tribal as our own species is I imagine we would have gone to war eventually and one exterminated the other (assuming no large difference in population, technology, etc.). I think that might have been what happened to Neanderthals?

But still, the thought of going about day-to-day business alongside, let's say homo floresiensis, has something intriguing to it. Perhaps it's the same reason we imagine interaction with extraterrestrial life - it's really just a reflection on us and our own humanity.