K-ON!! Official Band Yarouyo!! ~Let's MUSIC!! 4~

K-ON!! Official Band Yarouyo!! ~Let's MUSIC!! 4~ (「けいおん!!」オフィシャル 「バンドやろーよ!! 〜Let's MUSIC!!4〜」) is a collective album of the band Ho-Kago Tea Time, containing various "TV size" version of previous songs and also six instrumental versions of the song GO! GO! MANIAC.

The featured songs are sung by Yui Hirasawa's and Mio Akiyama's respective voice actresses Aki Toyosaki and Yōko Hikasa. The album was released on the 15th of June 2011 in Japan by Pony Canyon.

Track Listing

 * 1) Cagayake! GIRLS (4nin Ver.) (TV size Ver.)
 * 2) Don't say "lazy" (TV size Ver.)
 * 3) Cagayake! GIRLS (5nin Ver.) (TV size Ver.)
 * 4) GO! GO! MANIAC (TV size Ver.)
 * 5) Listen!! (TV size Ver.)
 * 6) Utauyo!! MIRACLE (TV size Ver.)
 * 7) NO, Thank You! (TV size Ver.)
 * 8) GO! GO! MANIAC (Instrumental)
 * 9) GO! GO! MANIAC (Instrumental - Guitar 1)
 * 10) GO! GO! MANIAC (Instrumental - Guitar 2)
 * 11) GO! GO! MANIAC (Instrumental - Keyboard)
 * 12) GO! GO! MANIAC (Instrumental - Bass)
 * 13) GO! GO! MANIAC (Instrumental - Drums)