They're from New Orleans, and they make good funk music.
Yeah, that pretty much covers it.
Here's one option:
Press play on this hour-long live video and let it go.
It's that kind of music, really - you're not always going to be into it, you're not always going to want to follow it, necessarily - but it'll be there, and that's really nice, too.
You'll probably find that you're tapping your toe pretty much the entire time, and that's a very good thing.
Another option - and I don't really recommend this - is to try to pick out a few Galactic songs that you especially like. It's difficult, because they tend to blend into one another, but it can be done. Above, "I Get Lifted" is a personal favorite. "Vilified" is great, too.
The problem is that they release very little studio music - it's almost all jam band stuff and recordings of live shows.
They talk a lot about love - and it's kind of lame sometimes - because it's all, like music-y love, not love-love.
But they make good music! And like I told you - that's really all you need to know about them.