das Musikstück
piece of music
A single, self-contained musical composition, regardless of its length or style.
Der Pianist spielte als Zugabe ein kurzes, unbekanntes Musikstück.
As an encore, the pianist played a short, unfamiliar piece of music.

piece of music
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piece of music
A single, self-contained musical composition, regardless of its length or style.
Der Pianist spielte als Zugabe ein kurzes, unbekanntes Musikstück.
As an encore, the pianist played a short, unfamiliar piece of music.

The word is made up of 'die Musik' (music) and 'das Stück' (piece). 'Stück' is used here in the sense of 'individual element' or 'work', similar to 'Theaterstück' (play).
Dieses Musikstück dauert nur drei Minuten.
This piece of music lasts only three minutes.
You can do various things with a 'Musikstück' (piece of music). Typical verbs are: 'ein Musikstück spielen' (to play a piece of music), 'hören' (to listen to), 'komponieren' (to compose/write), or 'aufführen' (to perform in front of an audience).
Der berühmte Komponist hat dieses Musikstück für seine Frau geschrieben.
The famous composer wrote this piece of music for his wife.
'Musikstück' (piece of music) is a very general and neutral term. It can be used for a composition from any genre (classical, jazz, pop) and of any length, whether with or without singing.
In der Prüfung mussten wir ein klassisches Musikstück analysieren.
In the exam, we had to analyze a classical piece of music.
music
'die Musik' and 'das Musikstück' can both mean something made up of sounds that is played or heard. 'Musik' is the general term and can mean a whole type of music, many songs, or something playing in the background. 'Musikstück' is more specific and means one individual, complete work. The words can be confused because a piece of music is, of course, music. If you are speaking generally about what you hear or like, 'Musik' fits. If you mean one specific individual work, 'Musikstück' is more precise.

In der Stadt hast du vor dem Termin ein kurzes Musikstück gehört.
In the city, you heard a short piece of music before the appointment.
Die Lehrerin erklärt der Klasse, warum Musik bei der Veranstaltung wichtig ist.
The teacher explains to the class why music is important at the event.