Catchy Songs: is there a science?

Catchy songs can be great! I mean that one good song over and over in your head for the rest of the day, or week, or two... it's the best feeling ever, right?
No not really. It can be a real concentration drainer, it can keep you up at night and it can annoy your loved ones.

What makes a catchy song?:
Don't have a song stuck in your head?
Don't be shy... go ahead and choose one!
Your welcome!

Pink Fluffy Unicorns

Pedobear

North, South, East and West

Surfin' Bird

Conga

The science behind catchy songs:
Technically, there is no science behind making a catchy song, but here are my findings on why songs can be catchy.

They aren't whole songs:

"The sticky songs we call earworms engage what psychologists call the Zeigarnik Effect: our tendency to experience intrusive thoughts about things we start and don't finish. A song's catchy hook or chorus is particularly prone to intrude your thoughts if you don't know the next verse, leaving them unfinished in your mind." - Lifehacker

More evidence!

The songs that get stuck in people's heads tend to be melodically and rhythmically simple, says Daniel Levitin, [...] It's usually just a segment of the song, not the entire thing from beginning to end... "What we think is going on is that the neural circuits get stuck in a repeating loop and they play this thing over and over again," Levitin said. - Lifehacker (again)

So if you create a song that is simple, has a decent, steady beat, and when played it feels incomplete.
Then you have a catchy song!

How to get rid of a song stuck in your head:
Now that you have a song in your head, let's try to get it out!
Use any of the following methods. Become your own experiment!

Learn the lyrics:
Find the song by using Shazam or Soundhound,
Write down the lyrics,
Write down a different songs' lyrics,
Talk out the lyrics,

Distraction Method:
Play a different song,
Do a puzzle (specifically, anagram),
Stop your own thoughts (try to not think),
Earwurm,
Unhearit.com,

Other:
Give in and listen to the song on repeat,

My experiences:
I got a song stuck in my head while doing this post! So here's what I did.
First I decided to read all the lyrics. Done, It's still in there, but with all the lyrics.
I listened to another song, it worked, but now there's another song in my head.
I read some research on how to get songs out of your head and the songs went away, for now...
It's an endless loop!

Here's some food for thought:
What if songs are always playing in your head whether you are aware or not!?

What is the most annoying song that has gotten stuck in your head?