This 4GB SDHC card comes preinstalled with Raspbian Wheezy, a Linux Debian based operating system optimized to run on the Raspberry Pi.
It's nice and convenient to have it pre-loaded instead of having to download the image. Ultimately I ended up going to a 32GB card, but this was a nice starting point.
We are small group of performing musicians on a tight budget. MCM products have worked very well for us. Always looking for more live sound deals.