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CDs are collectable items that appeared in Super Smash Bros. Brawl, and Super Smash Bros. for Nintendo 3DS and Wii U. Collecting one will unlock a new song in My Music.
The requirements of unlocking new songs from the CDs are, grabbing them when they appear randomly in solo/multiplayer modes if items are on, beating certain challenges, and grabbing one when you spawn the Mythical Pokémon Mew from the Poké Ball.