We all have something or another that can instill a sense of joy, be it simply a warm feeling or (in the case of the below music) uncontrollable smiling. Maybe it takes you back to a time that was memorable, or maybe the thing itself is just so charged with it's own "joy" that it manages to be uplifting on it's own.
And sometimes we need it.
Also, 'alternate' version from the 25 year special from OverClocked ReMix here. I cannot say which is "better", as both are things of beauty and should be appreciated in their own right. Both can certainly get me all choked up.