This is addtional content that enables the following songs:

Entrust This World to Idols ~ Idolatrize World (Original Touhou Song)
Xeno Phantasm (New Arrangement)
Absolute Queen
Star-Colored Night Sky
Kodoku Tsuki
kero9destiny - type130
Alice Maestera(REBIRTHED)
Necromantic
Syuki Rai Rai!
Calamity Fortune

More details on the official game page of Extra Song Pack 9 ...