You are....

 the sunshine of my life

Stevie Wonder

You are the sunshine of my life

That's why I'll always be around,

You are the apple of my eye,

Forever you'll stay in my heart

I feel like this is the beginning,

Though I've loved you for a million years,

And if I thought our love was ending,

I'd find myself drowning in my own tears

You are the sunshine of my life,

That's why I'll always stay around,

You are the apple of my eye,

Forever you'll stay in my heart

You must have known that I was lonely,

Because you came to my rescue,

And I know that this must be heaven,

How could so much love be inside of you?

You are the sunshine of my life, yeah,

That's why I'll always stay around,

You are the apple of my eye,

Forever you'll stay in my heart

Love has joined us,

Love has joined us,

Let's think sweet love