Sorry for hijacking the 'one/a few song thread' but I cant pick just one (or a handful for that matter - this is actually a condensed list of 'MY SONGS' for me!). Music is the key to my sanity...
Patrick Wolf - A BOY LIKE ME! "A boy like me should know much better than to raise his flag in stormy weather, but i just cant get enough electric shocks... I want to buy a lighthouse and ride a giraffe on the rocks!" (Listening to it as i type), Wolfsong, Teignmouth, Don't Say No, The Magic Position, Augustine and Overture (though every song from him that ive heard is genius and beautiful).
Regina Spektor - Almost everything from her makes me happy/warm and fuzzy.
AFI - Days of The Phoenix, actually pretty much any of their songs!
Adam Ant - especially Prince Charming (thats MY SONG - i know the dance...).
Billy Idol - Rebel Yell.
Machine Head - From The Day, Crashing Around You, Desire to Fire.
Anthony Johnson - Cripple and the Starfish (i have a live version that just tears me apart), I Fell in Love With a Dead Boy, Fistful of Love, Hope There's Someone, You Are My Sister.
Sufjan Stevens - For The Widows In Paradise, Vitos Ordination Song, Borderline, Sister Winter, To Be Alone With You, Come On Lets Boogey To The Elf Dance!, The Henney Buggy Band.
Rancid - Old Friend.
NIN - All The Love In The World, Closer, In This Together.
The Faint - Everything i have heard has had relevance at some point.
Medicine - Time Baby 3.
Misfits - Halloween (also AFI cover is wondrous!), Helena, Attitude, Die Die My Darling, Where Eagles Dare.
The Cure - Burn, End of The World, The Hanging Garden, Just Like Heaven, Lovesong, Close To Me, A Night Like This, Six Different Ways, Catch, Hot Hot Hot!, Pictures of You,
Dead or Alive - You Spin Me Round.
U2 - With Or Without You (not really my song, but reminds me so much of a friend - his song i guess).
Joshua Radin - Closer.
Adrift - Transatlanticism (Death Cab cover).
INXS - By My Side.
Neutral Milk Hotel - Two Headed Boy (1 & 2).
Counting Crows - Lot of songs, but particularly Colourblind and A Murder of One
Bright Eyes - Easy/Lucy/Free, First Day of My Life, Hungry for a Holiday, Lover I Dont Have To Love, Roots, Nothing Gets Crossed Out.
The Cult - She Sells Sanctuary.
Final Fantasy - This Lamb Sell Condos.
* I probably missed the point of this thread entirely, but i get excited when it comes to my songs/bands!