This is the 224th most frequent German word.
österreich
"Österreich" means "Austria" in English.
In this sentence, 'Österreich' is again used as a proper noun, indicating the origin of the musicians.
Viele berühmte Musiker stammen aus Österreich.
Many famous musicians come from Austria.
Here, 'österreichische' derives from 'Österreich' to form an adjective describing food from Austria.
Das österreichische Essen ist sehr lecker.
Austrian food is very tasty.
Here, 'Österreich' is used as a proper noun referring to the country Austria.