Find a dungeon, ancient city, woodland mansion, stronghold, bastion remnant, or other structure with loot chests
Kill a creeper with a skeleton, stray, or wither skeleton’s arrow to make it drop a music disc
Use a skeleton or stray to kill a creeper for disc drops
Loot chests in structures that can contain music discs
Trade with a wandering trader for music discs in versions or datapacks that allow it
Complete the “A Complete Catalogue” advancement by collecting all music discs
Use commands in Creative mode to give yourself music discs
Use a jukebox with a music disc to play it and then retrieve it by breaking the jukebox