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Pot Pourri 6 simply because the album starts off with all the internet co. loids wishing Gumi a happy birthday (the album was made partly to celebrate Gumi's 10th birthday). Also because a lot of different artists contributed to it.

Essential Milk Cafe since it was designed specifically for people to see whether or not Milk Cafe's music is right for them.

Sound Fraternity since it has such a diversity of song styles.

Megoistic Palette 2 if you're the kind of person who regularly thinks "I miss the old Nico Nico Douga".