Ana Moura at the Barbican

Some traditionalists won’t take kindly to the idea of a fado singer covering a ballad by Joni Mitchell. Yet the fact that A Case of You slipped so comfortably into this concert — part of the La Linea festival — is surely a sign that Ana Moura can reach out to a broader audience without compromising her art. Songs about longing (what the Portuguese call saudade) speak in all languages.

Numbers from Moura’s new album, Desfado (easily one of the outstanding releases of the past 12 months), were studded throughout this taut, compelling performance. When she played this venue in 2011 she was flanked by a conventional guitar trio. This time the group, with the graceful Angelo Freire on Portuguese guitar, was augmented by