Dipping Things In Stuff - Andrew Jackson Jihad ( great acoustic folk-punk band)
https://www.youtube.com/watch?v=3c54gn78cws
I listen to a lot of DSBM (depressive suicidal black metal) (look it up!) but it can be some really dark stuff and usually makes me question my existence more than cry in the physical sense.
This one's inevitable I think. An all-female acapella barbershop quartet sang it at my Mum's birthday party yesterday and it was AMAZING.
And my favourite version:
Recently watched Pixar's inside out and this was on the opening. I know it's more of short animation than music but I can't believe i cried over volcanoes.