lyn1

[hallow jungle]

Please be patient

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[kindred timber]

That's right (though it should be elle__s__ not elle in your first example, and « musiciens » is masculine plural), adjectives agree with the thing they're modifying. There are several forms for adjectives and they agree in different ways. « courageux » for example do not agree in the same way as « méchant ». This is because « courageux » already ends with an -x (normally a plural form of the masculine) so it stays the same for both masculine singular and plural.
To learn more, you can take a look at this page.