Jon Burlingame How do you score a show that tinkers with time, features a Norse god who is neither hero nor villain, and continually confounds the viewer with new mysteries?That was the challenge facing English composer Natalie Holt, who with her music for “Loki” becomes only the second woman to compose the dramatic score for a Marvel Cinematic Universe film or TV series (after Pinar Toprak, who scored 2019’s “Captain Marvel”).The music of “Loki” is a bold combination of a traditional orchestra