Hmmmm... I can't think of one. I'll list a few.

Evanescence - Give Unto Me
Evanescence - Hello
Evanescence - October
Coheed and Cambria - Wake Up
Jimmy Eat World - 23
The Dresden Dolls - Glass Slipper
Brand New - Okay, I Believe You, But My Tommy Gun Don't
Lacuna Coil - Stars
Nightwish - Sleeping Sun
Luther Vandross -Dance With My Father
Slipknot - Vermillion (I dislike most of their stuff, but this song is amazing)
Tori Amos - Seaside
Utada Hikaru - Exodus '04

A lot of songs. I don't know why, but there is something about these songs that are so beautiful and meaningful. In some songs on the list, it's for the lyrics or the fact that it reminds me of love, in others it's the way it's sung or the music in it, because it inspires me to want to work harder to learn piano.