"once composed" is a correct and usable part of a sentence in written English.
You can use it to refer to something that has been put together or organized, especially after a period of time. For example, "After a long process of trial and error, the research team once composed a comprehensive report of their findings."
Once composed, the dancing is not improvised.
Once composed, Zimmerman and Ina were off on a light and airy journey through their program.
At once composed and defiant, Mr. Olmert devoted the first part of his almost 10-minute speech to extolling his government's achievements on issues like security and poverty.
Is it quite believable that the captain has "more than once" composed letters to Lahardane, "but each time... drawn back when the moment of posting came"?
Several towns have apparently been won by parties representing refugees who once composed a majority of the residents but were driven out in ethnic cleansing.
TOM LEHRER, a satirical song-writer with a scientific background, once composed a lyric that was simply the names of the chemical elements as then known.
This Russian master's 15 quartets are haunting and confounding works, at once craftily composed scores and deeply personal chapters of a musical memoir.
Cage in turn created music inspired by Lippold sculptures, and it is said that once Cage composed music to be piped into the Pan Am Building lobby to accompany "Flight" but Lippold vetoed the idea.
In addition to writing six very different drafts of the script, he made three trailers, for which he auditioned, rehearsed, and directed the actors; drew storyboards; designed costumes; found locations and got permits; acted as the director of photography, overseeing as many as four cameras at once; and composed music and special effects.
Once he composed himself and took an obligatory photo Smyth called the fire brigade, who rescued her.
Once I composed myself I went into a chemist and used one of their sample perfumes to spray myself, I was completely paranoid that I smelt of faeces.
