Recording studios typically do not use silver for interconnect as it would be prohibitively expensive as the runs can be quite long (input boxes, patchbays, console, etc). There can easily be thousands of feet of cable in a small studio. It would also be sorta moot because the XLR, TS, RCA or any cables the artists use in their own gear would be copper.
That being said, some mastering studios DO use silver wire as they're mostly concerned with a stereo run or two in between a few EQ/Compressors. A lot of mastering gear is also modded to include silver. Actually just saw a Sontec EQ listed that has 50 years of mods including a silver wire swap.