War Thunder Japan Theme But Better-Mati-Ass Torres

https://www.youtube.com/watch?v=bSW8gZhkZ5w
She sang it live on a stage at one time. 
The source of audio is in that video.

California Dreamin' By Miki Matsubara

https://www.youtube.com/watch?v=Dq7pyC4rGrY
Original creator of the Mashup.

https://www.youtube.com/@Rhee
The one who posted the original video which is where the audio comes from

Creator:https://www.youtube.com/watch?v=9clWdowyOTA
Der Klaviermusiker

Creator: Karl Sternau 
https://www.youtube.com/channel/UCruyi0u8TNL2ZFBa2Y_Lyqg

Creator: The Southern Singer
https://www.youtube.com/watch?v=B5bRGMQzkfk