THEORY

==Background==
"THEORY" is 164's third album which contains 15 original tracks, plus one bonus track. Unlike the two previous albums, all of the songs are sung by GUMI. Utaite Espei is also featured in the song "The Last Promise". Track 16 is a bonus track.
==Preceding and succeeding albums==
MEMORY.jpg|MEMORY
BLURRY.jpg|BLURRY
==Track listing==
==Promotional goods==
Included with the album are the following limited edition benefits:
* One of two mousepads featuring "Reset" and the album cover, randomly selected.
* An original phone strap.
* An original clearfile that can be obtained by submitting a questionnaire included in the album.
* An original B2-sized poster that can be obtained at specific stores.
==External links==
===Official===
===Unofficial===
==Navigation==
Category:Albums
Category:Japanese albums
Category:Albums featuring GUMI
Category:Albums featuring Human vocals and voices