[Olog-hai]

That’s interesting. How long have they done it, collectively speaking? The piece of music in question just is never part of my 4^th; many others are, and those being US-themed.

[Borges]

As long as I can remember. The article suggests it really got going in the 1970s.

http://www.latinospost.com/articles/22845/20130704/4h-july-2013-boston-pops-fireworks-spectacular-concert-events-time.htm