While there are more than a few music-themed cards in Yugioh, the one to rule them must surely be the appropriately named Musician King —https://yugipedia.com/wiki/Musician_King —.
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Regarding the card's details, I'll keep it short and say they're meant to evoke what a performance by @funkmasterrex would no doubt be like.
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And yes, Melodious and Symphonic Warrior are real card archetypes:
— https://yugipedia.com/wiki/Melodious
— https://yugipedia.com/wiki/Symphonic_Warrior
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Tuning, Concentrating Current, and Downbeat are real cards as well:
— https://yugipedia.com/wiki/Tuning
— https://yugipedia.com/wiki/Concentrating_Current
— https://yugipedia.com/wiki/Downbeat

It's not that cold here but I still get a bit groggy in the morning.

It's better off than the Stag Nation, I'm led to believe.

You know him, you loathe him, the one but as it turns out not only @mgoveia.
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At first I couldn't grasp how so many people could harbor such animosity towards one user. Let's just say I'm older and wiser now. That and, you know, he ruined MLP for everyone on this site. (People like him tend to do that.)
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Given this, there could be no better pick for him than Nightmare Horse — https://yugipedia.com/wiki/Nightmare_Horse —.

Now this seems a tad nihilistic, but rest assured that there is hope. For there are people who do have totally original ideas, who don't follow what others say and make up their own minds and opinions, and who are not like the other girls.

Can't you hear, can't you hear the thunder?
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If the past few year have been any indication, the imagery in the card art isn't all that inaccurate. Hopefully, this year will be better.
Speaking of card art, this one fittingly enough comes from one called Convulsion of Nature — https://yugipedia.com/wiki/Convulsion_of_Nature —. I didn't even change the effect, that's literally what the card does.
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Convulsion of Nature was one of favorite cards to play back in the day, and one I had a physical copy of, too. Despite its name, it's not that powerful, but its unique effect certainly made duels more interesting.

Commemorating the raising of the Union Flag at Sydney Cove on January the 26th, 1788 by the very first European settlers of Australia, this holiday serves as the National Day of this country. Like many colonies of the British Empire, Australia's history has not always been rosy; thus the significance of this holiday has changed over time. Currently, it aims to emphasize the diverse cultural landscape of the nation and to promote a sense of community.
If I recall, we do have Australians on this site. If so, I hope they're having a bloody ripppah of a time in their thongs (it's summer there now, right?) while puttin' some s̶h̶r̶i̶m̶p̶ prawn on the barbay and drinking anything besides Foster's. (Sorry, I'm not too familiar with Aussie slang. Learning it is hard yakka.)