Those are great suggestions. SCV4 is my favorite video game OST of all time. It will be incredibly difficult choosing 1 song from it!
As I said, ROC's OST is mostly original, and the few remakes will be very different from their past cv versions.
The cavern theme is a great idea. I haven't written my own melody for the cavern in ROC yet, so there is a vacancy there. Thanks!
I'm glad that you liked my work in CTLC. ROC's OST will not dissapoint you! : )