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Prerequisites
As mentioned in other places, Concerto runs on Linux.
It uses Ruby on Rails, Phusion Passenger, a webserver (usually Apache 2), and a number of other prerequisites.
As is true with many large software systems these days, Concerto 2 is both available as a preconfigured Virtual Machine, and much much easier to install that way. We strongly recommend that you do so for your first install, as it's much easier not to have to fight with the suspension and brakes while you're learning to drive.
What is usually the most current tagged version of Concerto is available prepackaged as a .OVA VM package, and to run that, you'll need the appropriate tools installed on your target Linux machine.
You'll also need a machine that can do VT-x virtualization. VT-d device virtualization is nice, but probably not necessary; most current machines that do one automatically do the other anyway. These are generally knobs in your BIOS; we'll tell you how to find them when we get to that step in the install.
Going forward, we'll sort of assume you're doing this on a fresh new box with nothing else on it; the odds are better - if that's not the case -- that you already have enough experience to avoid the pinch points in installing alongside other software, though we'll point them out anyway.
That said, if you're installing on an existing machine, you are expected to ignore instructions like "format the hard drive, and install Ubuntu as a host OS", understanding that those would wipe out what you're already running. :-)
As always, this is free software, and documentation, and if using or following it breaks something, you get to keep both pieces; nobody involved -- especially RPI -- undertakes any legal responsibility to you in such cases.