Here's some interesting information ...
From the Library of Congress copyright records ...
In March 1999, through six documents, Gene Landy and his girlfiend, Alexandra Morgan, assigned their share of the copyrights to 213 musicial compositions

to Brian. All of these songs originally were credited to Brian and Landy, with Morgan also credited on 43 of them. A handful also carried credits for various third parties - Jardine, Usher, etc. (those credits remain intact, by the way).
This is the complete list. How many have you heard?
Actors in plays
Ain't nothin' to hide (co-writer: Morgan)
All over me
Angel
Baby
Baby, come back to L.A.
Baby, let your hair grow long (co-writer: Morgan)
Bad time soon forgotten
Be a brave guy
Being with the one you love (co-writer: Morgan)
Big man, little man
Bill sounds that way
Birds of love
Boogie's in town
Brian (co-writer: Morgan)
Bubble gum song
California
California calling (co-writer: Jardine)
Camp California (co-writer: Morgan)
Can I trust her?
Can you see it
Car song
Carl & Gina (co-writer: Morgan)
Carte blanche
Chestnut prison
Christine
Christmas time
Come back here
Concert tonight
Country feelin' (co-writer: Morgan)
Crack at your love (co-writer: Jardine)
Daddy's little girl (co-writer: Morgan)
Do you have any regrets? (co-writer: Morgan)
Doin' time on planet Earth
Don't be bad to me
Don't let her know she's an angel (co-writer: Morgan)
Don't you just hate it?
Don't you just love it? (co-writer: Morgan)
Dr. L
Dum-be-do
Erotic dreams
Everybody
Everytime
Exerciser, The
Fairy tale (co-writers: Foster & Morgan)
Fantasy girl
Feeling goin' round
Future
Games two can play
Gidget
Give me your love
Glory Hallelujah
Good guys
Good night Irene
Good sunshine
Hard for me
Have you ever been in love before?
Hawaii
He couldn't get his poor old body to move (co-writer: Buckingham)
Heavenly bodies
Heavenly love
Here we are (co-writers: Foster & Morgan)
Here where I live
Here with me
Hey, Mr. Athlete
Hey, Mr. Space Cadet
Hey yeah
Honey
Hot temper
Hotels of Honolulu
Hotter (co-writers: Paley & Morgan)
I feel this love (co-writer: Morgan)
I gotta get back to you
I love the girl so much
I love to roll
I May Mah
I need your sweet loving mind
I sleep alone (co-writer: Morgan)
I wanna stay
I wanted you to love me (co-writers: Foster & Morgan)
I'm broke
I'm getting tired
I'm going home
I'm so lonely
I'm so tired
I've been thinking
I've been through this before
In my car (co-writer: Morgan)
Is there a chance?
It burns
It happened to me
It was in your eyes
It'll just be like crazy
It's cool
It's fine
It's good
It's gotta go somewhere
It's just a matter of time
It's the ocean & me
Jane
Jesus was my Savior
John & Bianca (co-writer: Morgan)
Just say no (co-writer: Usher)
Let it shine
Let me show it to you
Let's do it again
Let's get it on
Let's go
Let's go to heaven in my car (co-writer: Usher)
Let's stick together (co-writer: Morgan)
Life
Life is still a thrill
Life's not a fantasy
Little children (co-writer: Morgan)
Living doll (co-writer: Morgan)
Looking for a place
Lost song
Love and mercy
Love is the music of life (co-writer: Morgan)
Love will have meaning again
Love ya (co-writers: Gold & Morgan)
Lover boy (co-writer: Morgan)
Magic
Magnetic attraction (co-writer: Usher)
Majors and minors
Make a wish (co-writer: Morgan)
Male ego
Malibu (everyone wears a smile in) (co-writer: Morgan)
Man under fire
Mary honey
Meet me in my dreams tonight
Melt away
Merry Christmas all over the world
Metal beach
Miller time
Missing sound
Move it all around
Movie show
Music in my head
My new girl
My solution
New direction
Night time (co-writers: Paley & Morgan)
No one ever says no
Not this again
Nothing to hide (co-writer: Morgan)
Off my chest
Oh, not this again
On the right track
One crazy summer
One for the boys
Our baby has grown up
Outta control
Passing friend
Pick yourself up & go
Please come back
Please stop
Pretty brown hair
Rainbow eyes (co-writer: Morgan)
Rings
Rio Grande
Robotech scheme
Rock and roll
Round and round
Sailing on the American dream
Saturday evening in the city
Saturday morning in the city
Save the day (co-writer: Foster & Morgan)
She sleeps alone (co-writer: Morgan)
She wants to be my girl
Sherrie
Shine on lucky star
Smart girls (co-writer: Morgan)
So glad
So long
Someone to love (co-writer: Morgan)
Spanish girl (co-writer: Schaeffer)
Spirit of rock & roll (co-writers: Usher & Kelly)
Song that wrote itself
Sorrow and stress
Still I dream of you
Still looking for the high (co-writer: Morgan)
Sunkist
Sunlight
Talkman, talkman
Terri, she need me
That magic night
There's so many (co-writer: Morgan)
This day was meant for you (co-writer: Morgan)
Tiger's gone, The
Time stood still (co-writers: Catona & Morgan)
Too much sugar, a.k.a. So much sugar (co-writer: Morgan)
Trust
Twenty-four hours a day
Wa-wa song
Walk with me
Walkin' the line (co-writers: Morgan & Clowes)
Walking on water
Wasted night
Water builds up (co-writer: Morgan)
We love you
We're not together
What went wrong? (co-writer: Morgan)
What's wrong? (co-writer: Morgan)
What's your dream?
When I met you
Why not us
Wondering what you're up to
Working on a rock & roll song.
Wouldn't it be cool?
You
You and me
You're not the same
(Given some of those titles, maybe a better question is: How many do you want to hear?

)