These are the most important songs that Yui sings with her band.
Three of them have a special meaning for her:

MY SOUL, YOUR BEATS!
This is the first song sang by Yui, in the 4th episode, when she tries to become the new leader and lead vocalist of GDM.
This episode is the only one with a different opening.

THOUSAND ENEMIES
The last song wrote and left by Iwasawa.
Yui is very honoured to be the singer of this important song!

ICHIBAN NO TAKARAMONO
The saddest and the last song for Yui.
It's the ending of the 10th episode and the BGM for Hinata and her.