No particular order, but limiting myself to one per artist:

Songs that make me feel less alone:

You've got a friend - Carole King or James Taylor
Leave it like it is - David Wilcox
Hey Jude - Paul and the boys from Liverpool
Oh my God - Jars of Clay
In Any Other World - Mika
When September Ends - Green Day
Come Ye Disconsolate - an old hymn
Imagine - John without the boys from Liverpool
Blowin' in the Wind - Bobby Dylan or Peter, Paul and Mary
Tennessee Christmas - Amy Grant
Bitch - Meredith Brooks
Love of My Life - Queen
Look What You've Done - Jet
I Believe in Love - Dixie Chicks
Angel - Sarah McLachlan
I Learned that From You - Sara Evans
Bridge Over Troubled Water - Simon and Garfunkel
You Were Always on My Mind - Willie
Safe in My Garden - the Mamas and the Papas
I'll Stand by You - The Pretenders
Eternal Flame - The Bangles
Don't Let Me Get Me - Pink
Lean on Me - Bill Withers

And a few songs when I might be ready to snap out of it - hard for me not to smile ever so lightly when I fire them up:

Flashlight - Parliament
Paradise City - GNR
Tubthumping - Chumbawamba
The Sign - Ace of Bass
Jack and Diane - John Mellencamp

Well, I got started and had a hard time stopping.
And you?