2 Musical Gaming Mysteries

This is just something that randomly came to my mind when I was driving around on my own tonight. I remembered 2 different instances where I thought I heard particular tracks from videogames, before the respective videogames actually got released. Or at least so I thought at the time. Maybe someone can help me make sense of this, especially with the first instance.

#1:

I remember many years ago, I used to binge websites with free videogame collections, you know, flashgames and stuff like that. Games made by random people.

Around the time when Super Smash Bros. Brawl was in development and youtube poops were really popular, there was a vertical SHMUP game floating around the internet. I can't remember what the story was or even who the main character is. But I remember that it was set in space and it only had like 4 levels. In the main menu, there was a hidden way to fight Weegee (yeah, that meme version of Luigi) but I forgot how exactly it worked.

But what sticked to my mind the most was the final boss, which is also the reason why I started this whole thread. It was some kind of sword, I suppose at least, with some differently colored crystals floating around it. The boss didn't really do much, it just chased you around slowly and had a shitton of HP if I remember right. The music used for this fight, was the music of the final boss in Super Smash Bros. Brawl, Tabuu. What's weird was, is that SSBB wasn't even out at that point. I'm pretty sure that the game still had like 9 more months until it finally released.

Now, does ANYBODY know which SHMUP I'm talking about? I cannot find any videos about it and also, how is it possible that it uses music from a game that wasn't even finished yet? Or maybe SSBB already released in Japan or something?

#2:

This one is much simpler. It's about the music from Sonic Mania that plays in Studiopolis Zone Act 1. The music is quite the banger, which is why I added it to my playlist. The thing is tho, that I'm really irritated by this track. Sonic Mania came out in 2017... but I distinctly remember hearing the music being used in some youtube videos long before that. Especially this part here that starts at 0:55:

I remember hearing this part of the music used in some meme videos and similiar stuff like that, in a sort of trolly way, long before Sonic Mania got released. Is my mind playing tricks on me? Or is it maybe like, that this music already existed before Sonic Mania or something, and they decided to use in the game? Or maybe the music already got revealed while the game was still in development?

When I heard this full music for the first time, I distinctly remember going something like "Wait I know this one! Finally I know where it's from! But wait a minute... Sonic Mania only came out recently??"

I recall that Studiopolis bgm was indeed leaked before Mania came out, though it was still 2016 or 17 when I heard it. Maybe it was used in a trailer or something like that, so it's very likely that it was used for content. Then again it could very well be similar to some copyright free stock music which you might be remembering too.

Or the timeline has been changed again and you remember a memory with an earlier patch, lol.

21 hours ago, Sonikkumania said:

I recall that Studiopolis bgm was indeed leaked before Mania came out, though it was still 2016 or 17 when I heard it. Maybe it was used in a trailer or something like that, so it's very likely that it was used for content. Then again it could very well be similar to some copyright free stock music which you might be remembering too.

Or the timeline has been changed again and you remember a memory with an earlier patch, lol.

nah it was definitely the part at 0:55, only thing I'm not completely sure of is when exactly I heard it or which exact videos it were