PLEASE READ:
THESE ARE THE VOICES YOU HEAR IN ORDER.
Starting from 0:28
Toshiro Histugaya........ Yasutora "Chad" Sado..........Mayuri Kurotsuchi, Ikkaku Madarame, Gin Ichimaru, Ganju Shiba, Kenpachi Zaraki (Shoutout to my haters sorry that you couldn't faze me), Uryuu Ishida, Shunsui Kyoraku
Nobody sings.
...
https://www.youtube.com/watch?v=wVbOfPAyJd0