There's a reason for a snowfall
A reason why a tree's tall
A reason why a star is bright
A reason why the moon glows
A reason why the wind blows
A reason why it's dark at night

But I don't know why I should cry
Just because you said goodbye

There must be a reason
I liket o know why
Oh why, oh I like to know
[ Lyrics from: http://www.lyricsfreak.com/c/cascades/theres+a+reason_20641885.html ]
There's a reason for a sunbeam
A reason for a daydream
A reason why the desert's dry
A reason why a stream falls
A reason why there's rainbows
A reason for a cloudy sky

I'd like to know why

There was a time when I could smile
We'd sit and talk of us while,
Times I never got your love
And thanked my lucky stars above

There must be a reason
I'd like to know why
(Why, oh why, why I'd like to know)
Please tell me why
I wanna know why