I've personally experienced GitadoLand on DM10GF11, and I don't know if something like it existed in earlier versions. GitadoLand is the combination of three words. "Gita" refers to GuitarFreaks. "Do" refers to DrumMania, and "Land" is "Land". GuitarLand is somewhat like a pie chart (not exactly, I'll explain in a moment), though instead of a circle, it's shaped to look like an island. When you register an account using the e-Amusement card system, you're randomly assigned to one of five teams. The team names are A, B, C, D and E.

At the end of every game (a game consisting of 3 to 5 songs, plus extra and encore songs if applicable), the machine takes the highest combo you got over all the songs, and that's your base combo score. It then performs the roulette thing mentioned earlier to apply a random multiplier. For example, if your best combo was 400, and you get a 3X multiplier, your total combo score for that game is 1200 points. Those points get added to your team's pool of points. With thousands of players, it's not unusual for your team to have millions of points, and for your contribution to seem pretty negligeable.

When the game starts, every team has zero points, and so each team has a equal share of the island, namely one fifth of it. Imagine that the island is a perfect circle. So GitadoLand looks like a circle with five lines radiating out from its center, equally spaced, as if they were going to the corners of a regular pentagon (like the yellow lines in this picture). These lines are the borders between each team's territory. So as you can see from the picture, GitadoLand sort of look like a clock with five hands. Each team's territory, or "country", thus has two borders: A clockwise border, and a counter-clockwise border.

Now as your team gets points, your country's clockwise border starts turning clockwise, and thus your territory gets bigger. However, if the country "behind" you starts getting points, then your country's counter-clockwise border also starts moving clockwise, so you start to lose territory. So all the borders are continously spinning clockwise at irregular speeds, with each country growing and shrinking over time.

Now what's the point of trying to make your country's territory as big as possible? Well, there are "artefacts" sprinkled across GitadoLand. There's five artefacts, and each artefact is actually represented by an icon (like a star, or a heart), and they are placed at even internals around the island, so initially, when all the team scores are zero, each team has one artefact in its territory. Each artefact is also associated with a song, so if an artefact is in your team's territory, you get access to that song. So over time, you gain and lose access to different songs in DM10GF11.

Your card also keeps track of how much you have personally contributed to your team's pool of point, and assigns a title accordingly. If you've contributed zero points, your title is "peon". It then goes "Citizen", then "Mayor", then "Golden Mayor" or something like that. That's the highest rank I achieved, so I don't know what the next few ranks are.

The method for assigning teams does not seem to try to do any skill-balancing. It sometimes occured that one team had 3 artefacts in its territory, and another had 0. Also, the borders don't move in a continuous way, but rather seem to "snap" to integral positions. Therefore, it's not uncommon either for an artefact to be "just" on the border between two countries. In this case, BOTH countries gain access to the secret song.

Finally, GitadoLand is reset every month. So if your team really gets royally screwed over, wait a month, and all the teams will be reset to 0 points, and also you'll be re-assigned to a new random team. When I was in Japan, I was in Team B, and then later in team A (I think the re-assignment is purely random, but I don't know for sure).

In DrumMania V, GitadoLand is replaced with GitadoTower. I haven't played DMV personally yet, so I don't know the details, but from Konami's website, it looks like they're almost the same thing (5 teams, based on combo and a combo multiplier, etc.), except that GitadoTower adds some sort of feature involving the different "floors" of the tower which I don't understand yet.