Here's a challenge : Think list as many songs you know that have the I vi IV V7 (C Am F G7) chord progression in any part of the song.  
I will make an exception: The IV chord can be substituted with ii7, and the V7 chord can be substituted with V.


A Teenager in Love - Doc Pomus, Mort Human
Africa - Toto
Amazing - Alex Lloyd
Baby - Justin Bieber
Baby It’s Cold Outside - Frank Loesser
Baby, I’m an Anarchist! - Against Me!
Barbie Girl - Aqua
Beauty School Dropout - Jim Jacobs and Warren Casey
Birdplane - Axis of Awesome
Can You Feel the Love Tonight - Elton John
Canvas Bags - Tim Minchin
Crocodile Rock - Elton John
D’yer Mak’er - Led Zeppelin
Do That to Me One More Time - Captain & Tennille
Don’t Trust Me - 30h!0
Donna - Ritchie Valens
Don't Stop Believing - Journey
Duke of Earl - Gene Chandler
Earth Angel - The Penguins
Eve of Destruction - P. F. Sloan
Every Breath You Take - The Police
Fall at Your Feet - Crowded House
Forever Young - Alphaville
Friday - Rebecka Black
Happiness Is a Warm Gun - The Beatles
Happy Ending - Mika
Heart and Soul - Hoagy Carmichael
I Can’t Explain - The Who
I’m Yours - Jason Mraz
If I Had a Hammer - Pete Seeger, Lee Hays
If I Were a Boy - Beyonce
In the Still of the Night - Fred Parris
Just One Look - Doris Troy
Kids - MGMT
Land Down Under - Men at Work
Last Kiss - Wayne Cochran
Let it Be - The Beatles
Let’s Twist Again - Kal Mann, Dave Appell
Lovable - Sam Cooke
Love Hurts - Boudleaux Bryant
Monster Mash - Bobby “Boris” Pickett
Man in the Mirror - Michael Jackson
No Woman No Cry - Bob Marley
Not Pretty Enough - Kasey Chambers
Nothing’s Gonna Stop Us Now - Albert Hammond, Diane Warren
Octopus’s Garden - The Beatles
Pictures of You - The Last Goodnight
Please Mr. Postman - The Marvelettes
Poker Face - Lady Gaga
Poor Little Fool - Sharon Sheeley
Real Love - John Lennon
Runaround Sue - Dion
Save Tonight - Eagle Eye Cherry
Scar - Missy Higgins
Self Esteem - The Offspring
Sex and Candy - Marcy Playground
She Has a Girlfriend Now - Reel Big Fish
She Will Be Loved - Maroon 5
Stand by Me - Ben King
Stay - Maurice Williams
Superman - Five for Fighting
Take on Me - A Ha
Tears on My Pillow - Sylvester Bradford and Al Lewis
The Book of Love - The Monotones
The Horses - Daryl Braithwaite
The Thin Ice - Pink Floyd
This Magic Moment - Doc Pomus, Mort Shuman
Those Magic Changes - Jim Jacobs and Warren Casey
Torn - Natalie Imbruglia
U & Ur Hand - Pink
Under the Bridge - Red Hot Chili Peppers
Waltzing Matilda - Banjo Patterson
When I Come Around - Green Day
Where Have All the Flowers Gone - Pete Seeger, Joe Hickerson
Wherever You Will Go - The Calling
With or Without You - U2
You Found Me - The Fray
You’re Beautiful - James Blunt
You’re Gonna Go Far Kid - The Offspring

There is a huge problem on ticalc.org: as of now, they have only 144 TI-BASIC quadratic solvers. 
How are we supposed to solve the quadratic formula if we have this small amount?

In the way I see it, a growing calculator community should have thousands of quadratic solvers!

Please submit your quadratic solver before the first of April.  Make sure to make your program unique!

If 100 of us submit a quadratic solver, thousands will be happy. 
_{[⸮​⸮​⸮​]}

Hello, I am ralphdspam.  I purchased my first TI-84 in september 2010.
Since then I have been learning BASIC and Axe, and failing in ASM.

I am happy to be here and participate in your discussions.

*Ralphdspam wants something to eat.