[REQ] Prism Lives instrumental songs?

[Jun33]

Hi everyone!

I'm a really big fan of the "Pretty Rhythm" saga, above all the "Rainbow Live" season. In this season, the characters do whta they call a "Prism Live" adn when it's the first time they do it, in background, is a instrumental song depending on each character instrument. Here is an example of Wakana's one (song strats at 1:12) which is the xilophone one:

https://www.youtube.com/watch?v=tVW0D_jAu4w

I've already donwload the full OST (or i think so), it's called "Pretty Rhythm Rainbow Live Music Colection" but even there I couldn't find those instrumental songs! That's why I want to know:

Where can I find them? Anyone know the name of the CD or the title of these songs?

Thanks to everyone