Guitar Hero Live more songs?

Hi everyone!

I got a little nostalgic and bought Guitar Hero Live for PS4.
Is there any way to add more content to the game?
I know I can on Rock Band 4 but the guitar doesn't seem to be compatible.

Really enjoy the game, but lacks many good songs. There seemed to be GHTV but that service is shut down.
Is there any way to download that content and use it offline?

Thanks in advance!!

// 4nders