Many songs do this to me.
"Stop This Train" by John Mayer did it in for me. He talks about watching his parents age, and know that their end is coming and how he is dealing with it. Made me ball like a baby the first time I heard it, mostly because I just don't wanna see my parents die at all.
When I was a kid, it was a song called "Perfect Fan" by the Backstreet Boys on their album Milennium. It was a song for their mothers, and I just really loved it.
And of course, most classical, romantic, and 20th century music have made me cry many times. Even when I was a child, the music just would move me to tears.