We Love Katamari REROLL+ Royal Reverie - Night School - 6 Sounds (100%) [WR]

There are normally 5 Sounds (instruments) to gather up in the stage. However, there is occasionally (perhaps 5% of the time) an extra one that appears on the desk above the one in the starting room. If you look closely, you can see it from any of the 3 spawn points if you turn your katamari toward it.
Sadly, as others have observed, the game hardlocks (black screen with no response to inputs; closing the game and restarting is the only option) just after the results screen. So you can't save your game with 6 Sounds.
Thanks to @Jobnsoso for the information about the 6th instrument. Curiously, his game didn't lock up afterward.

[@ThumbsOfSteel74]

Thanks for watching!
It's crazy what people find in these games!
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[@Kofize]

Consoles can probably get away with 6 showing at the main world. PC players will crash once we get back to the kings world.

[@swimminginoblivion5186]

I got 6 instruments but didnt hardlock afterward, i still have 6 as the highscore on my save file... Maybe bc i play on switch?

[@Kofize]

Yes. PC will crash.