Some of the songs can have other vocaloids substitutes for one or both singers of a song. To unlock them, you must play the song once for each extra singer after seeing the end credits. The following songs have alternate singers/duos. Listed are the song and the replacements that can be unlocked. After unlocking each alternate singer, check the music player on the menu to hear the song sung by the new singer.

Unlockable	How to unlock
1925	Rin, Len, Luka, KAITO, and MEIKO.
Animal Fortune-telling	Rin, Luka, and MEIKO.
Electric Angel	Rin and Luka.
Interviewer	Miku.
Mousou Sketch	Rin.
Piano x Forte x Scandal	Miku, Rin, and KAITO.
Reverse Rainbow	Rin/Len and Miku/Luka.
Romeo and Cinderella	Rin and Luka.
SING & SMILE	Rin, Len, Luka, KAITO, and MEIKO.
Snowman	Len.
Terekakushi Shishunki	KAITO.
Tricolore Airline	Rin, Luka, and MEIKO.
Watashi no Jikan	Rin and Len.