Mabinogi is actually a name for a bard, I believe. Something to those lines is said in the game by Nao, a special person you meet in the game.
The game's main feature is the ability to create music; it's quite fun.
But, that's not the only thing you can do, of course. There's fighting, along with multiple ways to fight; different ways to craft items through different life skills; just an overall brilliant game that fits into a social environment.
But, don't get me wrong, it's not just for sociability. There's PvP, PvE, trading, skill grinding, leveling, guilds, events, daily events, and so on.
This game is also related to Vindictus, occurring before Vindictus' time.
The story of Mabinogi is about the Milletians, the race you play as in the game world. You have the power to be reborn, you can die, but always be revived, and you can take the body of different races given to you as you rebirth.
Vindictus takes place after the Milletians officially die, being non-existant. You play as humans in a world gone corrupt without the help of the Milletians.
Now, Mabinogi is called a Fantasy Life for a reason. It's as if you play a role in a life as your own character (or multiple, if you so desire).
I've always loved this game, but I've been loving it more recently, due to the music I've been getting into. :3
JKangaroo, it'd be cool if you play it. If you enjoy music, you've gotta hear some of my music. xP
... And if you play, make a character on Alexina! All of my characters are on that server. xP
