die Symphonie
symphony
A large-scale musical composition for an orchestra, usually consisting of several movements.
Wir hörten Beethovens neunte Symphonie im Konzerthaus.
We heard Beethoven's Ninth Symphony at the concert hall.

symphony
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symphony
A large-scale musical composition for an orchestra, usually consisting of several movements.
Wir hörten Beethovens neunte Symphonie im Konzerthaus.
We heard Beethoven's Ninth Symphony at the concert hall.

You can easily recognize the meaning of the word from the context. If people are talking about music, composers, or orchestras, the musical composition is meant. In connection with impressions such as colors, smells, or feelings, it is used figuratively.
Die fünfte Symphonie von Mahler ist ein Meisterwerk.
Mahler's Fifth Symphony is a masterpiece.
In a musical context, 'Symphonie' (symphony) is often combined with certain verbs. Typical ones are: to compose a symphony, to conduct a symphony, to play a symphony, or to listen to a symphony.
Der berühmte Dirigent wird die Symphonie heute Abend leiten.
The famous conductor will conduct the symphony this evening.
In its figurative meaning, 'Symphonie' (symphony) describes a harmonious interplay of sensory impressions. The structures 'eine Symphonie der [plural noun]' (a symphony of [plural noun]) or 'eine Symphonie aus [noun]' (a symphony made up of [noun]) are often used.
Das Feuerwerk war eine beeindruckende Symphonie aus Licht und Knallen.
The fireworks were an impressive symphony of light and bangs.
concert
'Konzert' and 'Symphonie' can both have to do with classical music and an orchestra. Even so, they do not mean the same thing. A 'Konzert' is often the event where music is performed in front of an audience. It can also be a piece of music for a solo instrument and orchestra. A 'Symphonie', on the other hand, is a specific large-scale piece of music for orchestra, usually with several movements. Learners may confuse the words because a symphony can be played in a concert. In practical terms: you go to a concert, and there you might hear a symphony.

Am Wochenende spielt das Orchester eine berühmte Symphonie von Beethoven.
At the weekend, the orchestra is playing a famous symphony by Beethoven.
Meine Freundin besucht heute Abend ein Konzert in der Stadthalle.
My friend is going to a concert at the city hall this evening.