It’s a common programming procedure in the chamber music world to pair works from the standard repertoire with new compositions. Do people come for the familiar and stay for the new, or is it the other way around? At this genuinely brilliant recital by the Danish String Quartet, the answer was both. In the first part of the concert, that quartet stretched out in a dreamy exploration of Franz Schubert’s massive and intoxicating String Quartet in G Major, D. 887, op. 161. Violist Asbjørn Nørgaard introduced the piece by calling attention to Schubert’s immense authority as a composer of songs, saying that the composer’s gift for melody serves to slow the listener down, even to the point where one’s conscious mind “goes away for a little bit,” as he put it. The DSQ’s performance of this lengthy piece was sensational — focused, symmetrical, and perfectly blended, offering listeners an ideal opportunity to appreciate the composer’s expansive lyricism and adventurous dynamics.