The Hello! Project shuffle units (シャッフルユニット, shaffuru yunitto) were an annual event in the Japanese idol collective Hello! Project that started in 2000. The idea was to shuffle up the existing Hello! Project groups and soloists (e.g. Morning Musume, Country Musume, Aya Matsuura, Melon Kinenbi, and others) into one of three groups for a season-long collaboration to see which shuffle group can sell the most singles.
Each year's shuffle had a common theme: 2000's shuffle group theme, for example, was color and the groups were Akagumi (red) 4, Kiiro (yellow) 5, and Aoiro (blue) 7. Despite the commonality in theme and same B-side song, each group tends to sing a different style A-side song (details below).
Eventually, this became more of a tradition than a competition to outsell. In 2003 the three groups' songs were merged and sold as one single/mini-album. In the fall of 2004, only one unit was formed: The Hello! Project All-Stars, a collaboration of all 46 contemporary Hello! Project members to perform "All for One and One for All!".
If you had a room, he'd paint it white,
survives the day, prefers the night,
build sight.
Got a head for figures,
no time for bickers,
(or so he says,)
prefers the company of a woman.
Finds it more physical,
(that's an important word,)
always seen first then heard,
such a rare bird.
With praise he glows,
with change he grows,
finds that important,
hates waiting, it's not stimulating,
likes celebrating,
I can't understand why that is so funny,