To fight the third major boss in Paper Mario The Origami King in the Temple of Shrooms level, you will come across a Toad by the name of DJ Sound, who will task you with finding four Sound Discs located throughout the level to get the boss to appear.
But where exactly can you find all four of them? We have done all the leg work already for you, so you don’t have to! Here is where you can find all four of them:
The first can be seen in a Chest as you progress through the level naturally. You will notice the chest in a platform above Mario that appears unreachable. That is because you need to enter the room with the 1, 4, 3, 2 puzzle and use your Hammer to destroy the Coffin to the left of the room to access the area.
The second Disc can be found in the room with coffins that fall on Mario as you run past them. The Disc is hidden inside the final falling coffin, so make sure to get all the way to the right to unlock it.
The third and fourth Disc can be found in the room preceding the main dance floor, where you find DJ Sound for the first time. As you go down the stairs, you will find a room filled with different Coffins.
Find a Coffin with Sun on it, and you will see the Disc sitting there free to pick up. The fourth and final Disk is then located to the right of that one in a room behind a moveable wall. Hit the Light beside this hidden wall to get it to open and make your way to the end where the fourth and final Disk will be awaiting you.
Then take all these Disks back to DJ Sound and prepare yourself for the upcoming Boss Fight.