John Williams composed original music for her, including a pièce for violin, strings and harp called "Markings" (2017), a collection of arrangements of movie themes composed by him for violin and orchestra (recorded by Mutter and Williams with the Recording Arts Orchestra of Los Angeles in "Across the Stars", 2019) and Williams' second violin concerto (composed 2021, to be recorded by Mutter with the Boston Symphony Orchestra, the author as conductor, in 2022). Mutter also appeared as soloist in John Williams' debut concert with the Wiener Philharmoniker on 28 and 29 January 2020, recorded by Deutsche Grammophon and released in the live album "John Williams in Vienna", which became the best-selling album of orchestral music in 2020. Playing style and appearance Anne-Sophie Mutter is known for her versatile technique, dynamic range of style, richness of tone and articulate, colorful sound. Critics have noted Mutter’s personal and thorough interpretation of the music and dedication to the musical works she plays, as she often studies the letters, original scores, and other historical documents by the composer to guide her interpretation. Mutter often divides critics: some praise the sublimity, gracefulness, dexterity, intellectual energy, and sophistication of her music, while others view her playing overly refined, idiosyncratic and caught up in minute details and maintain that Mutter over-interprets works and imposes herself on the music. Mutter is known for performing in strapless gowns. Mutter explained that she felt having fabric on her shoulder made it too slippery to hold her violin firmly while she was playing. Instruments She owns two Stradivarius violins: the Emiliani of 1703, and the Lord Dunn-Raven Stradivarius of 1710, of which Mutter primarily performs on the latter. Mutter acquired the Emilinia from John & Arthur Beare in London in 1979 and the Lord Dunn-Raven from Bein & Fushi in Chicago in 1984. She also owns a Finnigan-Klaembt dated 1999 and a Regazzi dated 2005. Mutter has described her Stradivarius violin as her soul mate, saying “It sounded the way I (had) always been hoping. It's the oldest part of my body and my soul. The moment I am on stage, we are one, musically." Mutter ascribes the personal fit of her stradivarius violin to the "depths of the colors and the incredible amount of dynamic range." She prefers the Lord Dunn-Raven, stating that the Emilia lacks "a dimension: It has no edginess. I miss the unbridled power. I need this