sheet mu·sic
/SHēt ˈmyo͞ozik/
noun
- printed music, as opposed to performed or recorded music.
"a pile of sheet music"
- music published in single or interleaved sheets, not bound.
I would hardly call a chord chart a composition.
Again, splitting hairs and not emotionally attached to the idea. Jus’sayin

Things that make me go hmmm when I have too much time on my hands
sheet music
n.
Compositions printed on unbound sheets of paper.
(ref.) American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
com·po·si·tion
(kŏm′pə-zĭsh′ən)
n.
1.
a. The combining of distinct parts or elements to form a whole.
b. The manner in which such parts are combined or related.
c. General makeup: the changing composition of the electorate.
d. The result or product of composing; a mixture or compound.
2. Arrangement of artistic parts so as to form a unified whole.
3.
a. The art or act of composing a musical or literary work.
b. A work of music, literature, or art, or its structure or organization.
4. A short essay, especially one written as an academic exercise.
5. Law A settlement whereby the creditors of a debtor about to enter bankruptcy agree, in return for somefinancial consideration, usually proffered immediately, to the discharge of their respective claims on receipt ofpayment which is in a lesser amount than that actually owed on the claim.
6. Linguistics The formation of compounds from separate words.
7. Printing Typesetting.
[Middle English composicioun, from Old French composition, from Latin compositiō, compositiōn-,from compositus, past participle of compōnere,
to put together; see
component.]