Well. Ayu's collaborations have been pretty awful in general.
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Love ~Since 1999~ - is so BAD it's GOOD. But it's still bad. The awful Engrish, their voices do not match AT ALL. Cheesy cheesy lyrics/music in general. But it's somewhat catchy, weird and yeah. But still bad.
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A Song is Born - there's probably a good reason Ayu sang a solo version of this for I am... Keiko sounds like a howling banshee in this song. And the composition is pretty weak... too simplistic/repetitive. A lot of people think this song is the weakest on I am... even with Ayu singing solo because the composition is pretty poor.
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Dream ON - I guess this is technically Naoya's song, but... the music is nothing groundbreaking (stereotypical r&b sounding whatever) and their voices don't mesh too well. It's not a horrible song altogether, but again, nothing groundbreaking.
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Why... - Okay I think Ayu and Juno's voices sound nice together, but again, the composition is very poor, very forgettable song. "Just okay."
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ANother Song - Urata dominates this song (though not as much as Tsunku does in Love~Since 1999~ LOL), eh.. a very poorly composed, forgettable r&b song. :

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