You can not use those Concerto instructions for a Raspi. They are for booting a real computer with a USB or flash drive in "Live CD" mode.
You can follow these example directions, but I'll warn you, I have done a couple of these before and this past week I have been reloading one that went corrupt on the SD card, and the newer versions of the Raspi Kernel and software aren't working right. I can get everything going just fine, but then Xinit will crash after almost exactly 2 hours dumping you back down to the command prompt with an error message. This didn't used to happen with the same exact setup on the kernels from last Nov/Dec time frame. I've been banging my head against a wall trying to get this one working again, and after about 20+ hours on it, I'm about to ditch it all together.
There are several ways to go with these things, but basically you take the stock Raspian img and burn to your SC card. Boot it up and go through the raspi-config utiliity, set your local, language, keyboard layout, enable SSH, and I find an 800mhz overclock works fine without excess heat.
I chose to not boot the standard lightdm display manager, but to instead run Matchbox with Unclutter and the old Midori browser in full screen "kiosk" mode. If you would like, once you get your raspi to auto login with the default pi user according to the install docs, then drop the ".profile" and "kiosk.sh" into the home folder for user pi and reboot. If you have done everything correctly, then you will have a working concerto player that autostarts upon reboot. You may also want to create another sudo user for yourself so that you can log into the PI while the display is going and do maintenance or whatever, without effecting the pi user running the concerto slideshow. "this setup would work similar for Concerto v2, but I have my setup going to Concerto v1.9 server".
I have tons of notes on different setups, but the largest challenge you will have with any of them is the powersaving and screensaver timeouts, blanking your display after some time. There are lots of suggestions on how to get around this on the web if you just google "raspian screen blanking", in fact there is a thread on the raspi site about how to prevent screen blanking with some good info.