Like Ai no Uta, Tane no Uta was used in Japanese Pikmin advertisements. The song was never released as a single, however. It is not featured in any of the Pikmin games, but is in Super Smash Bros. Brawl.
Lyrics (roughly translated)
Blue pikmin doesn't drown
Yellow pikmin jumps high
Purple pikmin is strong
White pikmin... contains poison
(they) live with all kinds of personalities.
From the top of the head comes a sprout
From that sprout a leaf grows
From that leaf a bud appears
From that bud a flower blooms
Isn't it pretty when everyone gathers together?
Let us bloom all kinds of personalities.
The red sunset is burning
A face appears from the blue ocean
Born from the yellow star
From the purple dawn
A white day is starting