Learn how to download and install a Second Life/OpenSim viewer skin/theme.
The Second Life viewer skin folder is commonly located here:
Windows 32bit: C:/Program Files/SecondLifeViewer/
Windows 64bit: C:/Program Files (x86)/SecondLifeViewer/
Mac: ~/Library/Application Support/Second Life/
Royalty Free Music by Kevin MacLeod (http://incompetech.com).
Title: Prelude and Action.