O que significa a flash in the pan?

There's a new kind of music that's become very popular over the last years and I really love it. It's called bedroom pop and as its name suggests the music is recorded at home, rather than at traditional recording spaces. 

The popularity of a musical genre like that became possible today because of how democratic virtual spaces usually are. A band posts a video on YouTube and suddenly draws a lot of attention at once. But can they keep it?

What happens is that most of these bands that become successful overnight always run the risk of losing their popularity just as quickly. Just think of how many bands and singers had only one hit song! To describe those bands, we have an expression: a flash in the pan.

Someone or something is a flash in the pan when their success or popularity is short-lived. And that's also applied to anything else other than bands. A startup can be a flash in the pan, a movie star, a book, a trend, etc.

"This metaphoric term alludes to the 17th-century flintlock musket, which could be fired only when the flash of the priming powder in the lockpan ignited the charge in the bore. When it failed to ignite, there was only a flash in the pan and the gun did not shoot."

That's all for now guys. Talk to you the next time!!!!!