The Polyphonic Spree is far more than just a rock band. The group, led by singer/guitarist/songwriter Tim DeLaughter, is more like a combination of rock orchestra and chorus, with a membership that includes up to two dozen musicians and singers, creating a large, enveloping sound influenced by the orchestral pop of artists like the Electric Light Orchestra and the Beach Boys’ Brian Wilson. DeLaughter has masterminded this gaggle of musicians since 2000, when he created the group’s first live show. This fall, the Polyphonic Spree is celebrating its 15th anniversary with a tour focused on 2002 debut album The Beginning Stages of…, performed in its entirety. In signature white choir robes, the members of the Spree evoke a spiritual experience in their live shows.

When The Beginning Stages of… was released, All Music called it “the most euphoric, uplifting pop music imaginable,” and the Guardian said it was “a debut brimming with maverick ambition.” “What we created in those couple of days was more than satisfying to us but definitely not fashionable or popular commercially,” the band said in a statement announcing the anniversary tour. Now, it’s clear that they were doing something right.

SLS Las Vegas, 9 p.m. Nov. 18, starting at $22 plus fee, tax included, 21+. 702.761.7000