OMG~~ it's just too hard to pick!!!!
Music-wise, my favorite is Silent Jealousy!!! esp. at that at that 42nd second!!! just awesome!!!! i can't describ it!
Lyrics-wise, Crucify My Love just makes cry everytime i listen to it! Also Tears!!! Also Last Song!!!1 Last Song is so sad that it's THE last song.... total heartbreak man!!! big sigh~~~
Longing is a very special song for me, because it's the very first X-JAPAN song i ever listened to. And I'm such a big fan ever since!!!!!!! so i have to put it in my list!!