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Win the song "Clu Clu Land" (from the game "Clu Clu Land," apparently) by hitting the 1200ft. mark in the Home-Run Contest. Quite frankly, this song is really annoying, but at least you don’t have to go too far out of your way to get it.

Earn "The Legendary Air Ride Machine" by clearing the "Dragoon Strike" event. This dramatic piece from the Kirby series is composed really well, and I’d have to rank it as one of my favorite songs I’ve unlocked so far.

Earn "King Dedede's Theme," a remix of the classic Kirby boss music, by clearing "The Hammer of the King" event match. I like this piece because it has a similar feel to the original, only with a lot more energy.

Clear the event match "Go! Triple Finish!" to earn the Pokemon song "Road to Viridian City."

Win this jazzy Ice Climbers number by clearing Classic Mode on normal difficulty.

I just picked up this CD in a battle on Shadow Moses Island. The item just dropped randomly in the middle of the fight. It happened to be the 5th Brawl I had played and it was also the one when I unlocked Ness. I'm not sure if this is just a totally random item or if it was dropped by some requirement...