Some gestures are worth an entire concert. Laurie Anderson has the audience at L'Auditori under a spell when she starts playing. Junior dadThe song by Lou Reed and Metallica. Suddenly, the voice of Reed, Anderson's late partner, is heard. The screen in the background shows an image of him, not very clear but unmistakable. She picks up her violin and walks toward the screen, as if she wants to merge with the memory. You'd have to be a bad soul not to be moved. It's just one of the many memorable moments of the concert Laurie Anderson gave last Monday in Barcelona as part of the Jazz Festival program. A deconstructionist by nature, the 78-year-old American artist is currently on tour with Sexmob, the group of Steven Bernstein, a musician steeped in the New York jazz avant-garde associated with the Knitting Factory. All of this translates into eight musicians on stage, with a vast array of timbres and, above all, the ability to present different interpretations of Anderson's songs and covers, such as their performance ofIn hard rain's a-gonna fall, by Bob Dylan, based on the arrangement by the Kronos Quartet, and the wonderful It is a lovely day by Arthur Russell