This document discusses how works enter the public domain. It notes that copyrighted works originally published with a copyright notice receive copyright protection for 70 years after the death of the author. Works published before 1923 are in the public domain in the United States. Once in the public domain, works are freely usable by anyone for any purpose.

1. Public Domain
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BWV 1068, Mvmt. 2
J. S. Bach (1685-1750)
From orchestral suite number 3
Air
1