In the Central Train Station there is a Piano free to use and often people play it and the result is something that will give you goose bumps.
In the first video you can see how a person from Japan, in love with Italy and the Old Italian Songs, perform an amazing show singing "O' sole mio" and all the other people singing with him.
And here another day that confirm the rule...
This show us how people that doesn't know each other could perform a sing together becoming one single thing.
I love you all!
ps: videos are taken from youtube so clicking on them you can see the source.