I. The theme song of your life is…

… No. 1 song on the charts on your birthday or on your 18.th birthday, depending on the year you were born!
Just to increase the probabilities, check out both charts – UK and USA.
So first let's go to

http://www.thisdayinmusic.com/member/birthdayno1.php

"What was no.1 on the day you were born?"
Let's try it!

On my birthday:
It Doesn't Matter Anymore – Buddy Holly (UK)
The Happy Organ – Dave 'Baby' Cortez (USA)

I have no recollection whatsoever of having ever heard those two songs. Strange, being so much into oldies as I am…

On my 18.th birthday:
Free – Deniece Williams (UK)
When I Need You – Leo Sayer (USA)

Some bells have just started ringing: I've got some idea of "Free", but "When I Need You" can be considered, if not the, at least one of the theme songs of my life… And how!

"When I need you
I just close my eyes and I'm with you,
And all that I so want to give you,
It's only a heartbeat away.

When I need love
I hold out my hands and I touch love,
I never knew there was so much love
Keeping me warm night and day.

Miles and miles of empty space in between us,
The telephone can't take the place of your smile,
But you know I won't be travelin' forever.
It's cold out, but hold out, and do like I do.

When I need you
I just close my eyes and I'm with you,
And all that I so wanna give you babe
It's only a heartbeat away.

It's not easy when the road is your driver,
Honey, that's a heavy load that we bear
But you know I won't be traveling a lifetime.
It's cold out but hold out and do like I do
Oh, I need you.

When I need love
I hold out my hands and I touch love,
I never knew there was so much love
Keeping me warm night and day.

When I need you
I just close my eyes
And you're right here by my side
Keeping me warm night and day.

I just hold out my hands
I just hold out my hand
And I'm with you darlin',
Yes, I'm with you darlin'.
All I wanna give you
It's only a heartbeat away
Oh I need you darling."

Thanks a lot, Gumby! This was a fine idea indeed!