There are probably many many millions of songs U can find. From my very limited exposure, my own personal taste and biased opinion, I can only listen to very few songs over and over again without feeling tired of them.
I posted some of my favorite songs and some friends aslo posted theirs under "Songs U can listen over/over" before(
http://web.wenxuecity.com/BBSView.php?SubID=music&MsgID=35995).
Once again, I hope friends can share your favorite songs with others here. Thanks in advance!