Question: Six chansons pour piano was by the composer who became a naturalized citizen of what country?
Sentence (from "Iannis Xenakis"): Iannis Xenakis (Greek: Γιάννης (Ιάννης) Ξενάκης ] ; 29 May 1922 – 4 February 2001) was a Romanian-born, Greek-French composer, music theorist, architect, and engineer.
Relevant evidence: No