The War on Drugs performed their chiming new single "Holding On" Monday on The Late Show With Stephen Colbert.

Though the band recorded as a sextet for upcoming LP A Deeper Understanding, the line-up swelled to a nine-piece unit forColbert. Singer-guitarist Adam Granduciel was backed by three keyboardists, three guitarists, a bassist and drummer, forming a textured, grandiose wall of sound full of bell-like tones and slide-guitar fills.

A Deeper Understanding, described in a statement as a "band record," is out August 25th. The 10-track LP also features "Thinking of a Place," the psychedelic, 11-minute track previously issued as a 12-inch vinyl single for Record Store Day.

The War on Drugs will launch a major tour this fall. The band will kick of a North American leg on September 18th, followed by a European trek in November.

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Watch the War on Drugs Perform Grand New Song 'Holding On' on 'Colbert' - RollingStone.com