Ye, I can usually hear make out IA clearly in a chorus, since I listen to her too much. xD But Len sounds like a lot of female vocaloids- IA, Luka, and Kanon, and he can kind of sound like Rin too.
LOL Well, who makes the voice of Len is a girl xD. But you can heard to the version of IA and Kaito, the parts that IA sing there are the same that she sing here, so after you heard it you can totally see the differece.
enak baget di dengar apa lagi lagu ia & len enak aku suka aku mau bertemu sama len & kaito kalau kaito dia ada di jepang kalau len aku gak tau dia tinggal dia jepang atau ada di cina kalau tau len tinggal diamana tolong kasih tau ya