The history of landmark prog-rock band Yes is so expansive that there are currently two different versions of the band touring the world, each with extraordinarily talented musicians whose work was influential in the band’s development.

The version of Yes stopping in Vegas this week features singer Jon Anderson (one of the group’s founding members), guitarist Trevor Rabin (the driving force behind the band’s most radio-friendly music in the ’80s) and keyboardist Rick Wakeman (whose various stints in Yes date back to 1971). Among the three of them, they’ve contributed to Yes’ most well-known music, including classic early albums The Yes Album, Fragile, Close to the Edge and Tales From Topographic Oceans, plus pop-oriented mega-sellers 90125 and Big Generator.

The band’s current tour is dubbed Quintessential Yes: The 50th Anniversary Tour, celebrating the founding of Yes back in 1968, featuring songs from throughout the band’s long and varied career. The trio of Anderson, Rabin and Wakeman are also working on a new studio album, set for release next year, which will be the first in 28 years to feature the three particular members. The twisty, epic saga of Yes has yet to write its final chapter.

Westgate Las Vegas, 8 p.m. Sept. 1, starting at $40 plus tax and fee. 800.222.5361