The song Happiness is performed by Alison Krauss .
With your love I was complete
Like a haven safe from harm
Till the bitter stole the sweet
I was perfect in your arms
A precious while
I had your smile
Till it all fell apart
With one change of heart
The pain and regret will fade
But a fact of love will still remain
You can't always trust happiness
Love like a sweet parade
Till the saddest part when the music fades
You can't always trust happiness
If a single star I see
Ever made a wish come true
It would bring you back to me
But the best my heart can do
Is to love again
I don't know when
Still it's worth all I fear
The heartaches and the tears
Love like a lesson learned
When we pa*s the point of no return
You can't always trust happiness
There in love's steady glow
Hides the power to hurt us so
You can't always trust happiness