While the name of the band has remained the same, there have been line-up changes throughout the years. The first line-up played in concerts during 2011 in Tokyo, Sapporo, and Singapore (Mikupa), as well as the March 2012 concert in Tokyo (Mikupa).
In the Hong Kong concert, the lineup for MKP39 was changed dramatically. The only remaining member is Kouji Kinoshita, with Jun☆Murayama replacing Kei Suzuki on keyboards, TABOKUN replacing Toshiaki Monma on bass, and Ryoichi "KIKU" Kikushima replacing Yuuhei Matsuoka on drums.
Sapporo 2013 saw the return of Kouta Nakamura, and also the departure of Jun☆Murayama who was replaced by Imai Jun.
Kansai 2013 also saw the return of percussionist, Sachiko Wakamori.
According to the official MikuPa website, whilst Kei Suzuki is no longer performing as keyboardist, he continues to work behind the scenes as band master / manipulator.
Since 2014, the band lineup has slowly been replaced with the majority of the members from Magical Mirai 2015.
The 39's (The Thanks) are the band that accompanied Hatsune Miku, Kagamine Len, Kagamine Rin, and Megurine Luka during their 2010 concert in Tokyo (39's Giving Day) their 2011 concert in Los Angeles (Mikunopolis), and their 2012 concert in Tokyo (Final 39's Giving Day). In their final concert in 2012, in addition to the four Character VOCALOID, they also performed with MEIKO.
Since the 2012 concert, their band contract has not been renewed and future VOCALOID concerts have been using the second generation MKP39. However, they performed in the mini concert Matsuri Da Diva in 2014, Jun Abe did not perform in this concert.