Me too, I don't cry easily, there are really rare the occasions that I cry while listening to a song.
But I have to admit, Forever Love, especially The Last Live version, brings tears to my eyes (ok, ok, I don't really listen it because I can't stop crying >.< ). That happens every single time I listen to the song. I think it's because around the end Toshi's voice is really tearful and when I think that it was sung at the hide funeral, I simply can't stop.
Others would be Tears, The Last Song and Endless Rain, but usually they only make me sadder, only sometimes they really make me cry.