Each item in Minecraft has a unique ID assigned to it, known as an item ID, this can be used in commands to spawn the item into the game. The item ID for music disc in Minecraft is shown below:
The Music Disc item can be spawned in Minecraft with the below command. Cheats must be enabled before this will work.
Music discs can be placed into jukeboxes to play a music track. This disc in particular will play the Pigstep track. This item is only found within the Nether, inside bastion remnants.