Cities: Skylines Game Keys

Go to: http://store.steampowered.com/ and download STEAM client
Click "Install Steam" (from the upper right corner)
Install and start application, login with your Account name and Password (create one if you don't have).
Please follow these instructions to activate a new retail purchase on Steam:
Launch Steam and log into your Steam account.
Click the Games Menu.
Choose Activate a Product on Steam...
Follow the onscreen instructions to complete the process.
After successful code verification go to the "LIBRARY" tab and start downloading.

Take the stress out of your streets and relax while you re-district! From Tobias Gustavsson, composer of popular music packs for Europa Universalis IV and Crusader Kings II, comes the first-ever music pack for Cities: Skylines, featuring over an hour of original music for use with the in-game radio stations. Soothing jazz, lounge music, groove music, and even a pleasant Caribbean vibe can be found on the Relaxation Station, so tune in, kick back, and let our in-game DJ spin the relaxing playlist for your listening pleasure.