It's certainly not the real one[0], but looks a lot like the Winamp AVS/MilkDrop stuff. My Inspect Element -fu was however insufficient for getting a closer look.
[0] https://en.wikipedia.org/wiki/Neon_(music_visualization)
Now, I see this :)
If you're specific question was meant to be "did this person license this music legally for his site?" - yes, there's a chance he did. There's a chance he didn't. You'd have to ask him. Even if he did, that doesn't give anyone else rights to use those songs on their site.
which has three somewhat popular songs,
making royalty-free music emphatically not the topic.
What's the deal with the audio delay showing up for button taps until the icons have loaded?
The Xbox 360 is now considered a retro gaming device, that was such a reminder how old I am now, to note my first home computer was a Timex 2068.
I don't know if the Altair 8800 would count as my first home computer, as I was too young to really understand what it was and mostly just liked to play with the paper tape feed on the Teletype attached to it. By the time we got the PET 2001, I was old enough to actually use it as intended.
I still remember when all that Nintendo had were Game & Watch handhelds, before NES came to be.
I still love its controller design.