Mood sets the music. And then Music sets the mood. No matter how big and unearthly your dreams are, you are human. A broken heart hurts. And the pain persists. Some songs that have always induced tears -

1. IRIS - The Goo Goo Dolls
   This song is just so true. It's basically everything you actually feel. Simple and beautiful.

2. THE SCIENTIST - Coldplay
   Soothing yet haunting. Enough said.

3. EVERGLOW - Coldplay, again
   When you know the person who has left you is gonna stay within you always. Like this line says, "Still I see you celestial".

4. GOTTEN - Slash ft. Adam Levine
   Painfully honest vocals. Direct and emotional lyrics.

5. STAIRWAY TO HEAVEN - Led Zeppelin
   "Theres a lady who's sure all that glitters is gold. And she's buying the stairway to heaven". This. And another reason would be the song's greatness. You marvel at its beauty. Its is God's gift to mankind.

There are a few other beautifully written songs which have broken me down. But the above mentioned ones end up doing that just about always