This is the 3114th most frequent Russian word.
композитор
Composer.
In this sentence, 'композитор' refers to a specific person whose profession is writing music compositions.
Этот композитор написал красивую симфонию.
This composer wrote a beautiful symphony.
Here, 'композитор' is used in the plural form 'композиторов', referring to composers in general.
Мой друг увлекается творчеством немецких композиторов.
My friend is interested in the works of German composers.
In this case, 'композитор' describes the future aspiration of a person to pursue this profession.