New Music The avant-garde musician’s third live album features bold arrangements of old favorites along with new surprises Laurie Anderson. (Credit: Ebru Yildiz) By this point in her career, Laurie Anderson has become a national treasure of sorts. Her work is the apex of the avant-garde made accessible, high-minded and emotionally charged without being alienating. Anderson has spent her career making albums, visual art, and films that deal with the surrendering of humanity to technology, loss, and even Amelia Earhart. Her concerts are multimedia feasts that combine these multifarious aspects, thought-provoking performances complete with sections of song, spoken word, and visual effects. Surprisingly, Let X=X (Live), which features performances from Anderson’s 2023 tour with Sexmob, is only the artist’s third live record and first since 2002’s Live in New York.…