Igor Stravinsky (1882-1971) is reputed to have said that "Mediocre composers borrow, great composers steal." T.S. Eliot (1888-1965) either originated or borrowed or stole the line and reputedly changed it to say: "Mediocre writers borrow, great writers steal." Then that great pasticheur Pablo Picasso (1881-1973) claimed: "Good artists copy; great artists steal." Whoever: it's a great line. Probably a defining characteristic of Modernism.
Here is Ombra mai fu as originally set by Cavalli (1602-1676), borrowed by Bononcini (1670-1747), and ultimately stolen by Handel (1685-1759): a clearer example.
Cavalli:
Bononcini:
Handel:
Tender and beautiful fronds
of my beloved plane tree,
let Fate smile upon you.
May thunder, lightning, and storms
never bother your dear peace,
nor may you by blowing winds be profaned.
A shade there never was,
of any plant,
dearer and more lovely,
or more sweet.
And here you thought musicians' sampling was a copyright issue.