ABCD423: A Birthday CD for Niisan

==Background==
"ABCD423" (read as "A Birthday CD for Niisan") is the second edition of the free digital album made to celebrate KAITO's 11th anniversary. Being made by fans for fans, the project was started with the works of the participators, both as musicians and as artists.
The album consists of 11 tracks, all published on YouTube between February 14 to February 17, in the following order:
* DAY 1 "Folk, fantasy & fairytales": #1, #2, #3; 
* DAY 2 "With Heavy Hearts": #4, #5, #6; 
* DAY 3 "Love is (un)kind": #7, #8, #9; 
* DAY 4 "honesty and truth": #10 and #11.
==Track listing==
==External links==
===Official===
===Unofficial===
Category:Albums
Category:Albums featuring KAITO
Category:Albums featuring MEIKO
Category:Albums featuring Hatsune Miku
Category:Albums featuring Kagamine Rin
Category:Albums featuring Kagamine Len
Category:Albums featuring Megurine Luka
Category:Albums featuring other voice synthesizers
Category:Albums featuring Human vocals and voices