Minutes before Sunday’s concert began, when the Orpheum stage was littered with brass instruments lying on the floor but devoid of people, David Byrne made an announcement from backstage: Picture-taking was encouraged. So was audio/video recording. But what he encouraged most of all was simply enjoying the experience and capturing it in memory.

A necessary invitation? Hardly. The former Talking Head’s performance alongside St. Vincent (also known as erstwhile Berklee student Annie Clark) consisted of one jaw-dropping moment after another. The two musicians radiated joy from start to finish, not so much for performing for a rapturous, sold-out crowd (though that certainly helped) as for the sheer act of making music.