In this lesson Leonel "Guajiro" Gonzalez talks a little more about the history of the Cuban tres guitar. Its role and what music styles feature the Cuban tres.
The Cuban tres appears at the time when sextets—sones, habaneras, and guarachas—were in vogue, although it was not included in the instrumentation for any of them.
As Cuban music evolved, the tres [became] more and more popular, and I would say that it is at the height of its popularity
Nowadays, you can find a tres as part of the instrumentation in a typical orchestra, in a charanga, in a son orchestra, in a salsa orchestra, in a symphony, etc. You can find the tres in pretty much any type of musical group. The tres is as hot as ever, both locally and internationally.