This is the 8215th most frequent German word.
italien
"Italien" in German means "Italy" in English.
In this sentence, 'Italien' is used as a noun to refer to the country of Italy.
Ich träume davon, Italien zu besuchen.
I dream of visiting Italy.
Here, 'italienische' is used as an adjective derived from 'Italien' to describe the type of pizza being Italian.
Eine italienische Pizza schmeckt besonders gut.
An Italian pizza tastes especially good.
The term 'Italien' again refers to the country, used in the context of origin of the songs.