So how easy would it be to create something like that on Audacity?
You're not going to be creating any music with Audacity, it's an audio file editing program. You can make MP3 files with it, it doesn't create music on its own.
Since I suspect I can guess where this thread's going to go, the next question is going to be: Without Googling, do you know anything whatsoever about making music? Music scales? Notes? Music keys? Can you read sheet music? Without googling, do you know what the difference is between the white keys on a piano or keyboard and the black keys and what happens when you press keys on the far right and far left as you sit at these instruments? Can you string a composition together?
If you answered no to any/most of these questions, then I think you have a lot of learning to do beforehand. There are programs and methods online that you can use to "make" music but you need some theory behind it first, otherwise you generate some monstrosity that makes a yowling cat sound pleasant.
Note: "knowing anything about music" does not involve actively listening to any current Top 40 single.