The group was formed in 2005 by a group of friends who wanted to enjoy ensemble music under the call of vocalist and choral conductor Toyoki Tanaka. ''Millle" and "Uno" are the Italian words for "a thousand" and "one," respectively, in the belief that even a journey of a thousand miles begins with a single step. We have sung a wide range of a cappella works from the Renaissance to modern music. Recently, we have been working on Renaissance works, returning to our original intention. Since 2018, I have been participating in the Tokyo Spring Chorus Contest (Harukon.) For four consecutive years, we have been awarded in the Renaissance and Baroque categories; in 2020, we won the first place gold prize in the category and the President's Prize of the Tokyo Chorus Federation.