12-23 Feb, Ashton night: La Valse/ Thaïs/ Voices of Spring/ Mo notones I & II/ Marguerite & Armand (5 pfs). Tamara Rojo due to make her farewell performances to the Royal Ballet as a guest in Ashton's Margueriteand Armand, a condensed version of La Traviata, set to Liszt's piano son ata. La Valse comes from the Milan of 1958, an era of glamour and post-warambivalence, reflected in a work of seething waltzing to Ravel. Thaïs andVoices of Spring are contrasting pas de deux to Massenet and Johan Straussrespectively, Monotones contrasts two ethereal trios to Satie music in pe rhaps Ashton's most abstractly beautiful creation. Main castings: 12 Feb: