I am sorry to deliver the bad news: There is no general purpose blade for a bandsaw. You can buy a general purpose blade for your table saw, but not your bandsaw. Sometimes you have to suck it up and change the blades more often than you want. It took me a while to learn that lesson.
Bandsaws do three things:
1. Resaw thick boards into thinner boards, as thin as veneer.
2. Cut straight lines - rip cuts, crosscuts, etc.
3. Cut curves.
The choice of blades varies by:
* The type of cut you are making.
* The thickness of the wood you are cutting.
* If you are cutting curves, then the choice of blade also varies by the radius of the curve itself.
I was going to write another long treatise on choosing a bandsaw blade, but I found this article, which may help you as much as anything I could write:
P.S. After a warning for purists, at the bottom of the article, they say that you can use a 3/8 inch 4 TPI standard-tooth blade as a "general purpose" blade. I am skeptical. ... but the next time I am near Industrial Blade, I might buy one to try. :-)
P.P.S. I buy blades from Industrial Blade: http://www.industrialblade.net
P.P.P.S. Another great bandsaw resource is Iturra Designs, especially if you own an older Delta bandsaw. They are totally old school - no internet presence at all. They still have a printed catalog, and you call them to place mail orders. The catalog is a treasure trove of bandsaw wisdom, and prices are good:
4636 Fulton Road
Jacksonville, Florida 32225-1332