die Posaune
trombone
A low-sounding brass instrument in which the pitch is changed by moving a U-shaped tube section, the slide.
In der Big Band spielt sie eine laute Solo-Posaune.
In the big band, she plays a loud trombone solo.

trombone
Loading your saved state.
trombone
A low-sounding brass instrument in which the pitch is changed by moving a U-shaped tube section, the slide.
In der Big Band spielt sie eine laute Solo-Posaune.
In the big band, she plays a loud trombone solo.

As with most instruments, 'Posaune' (trombone) is mainly used with the verb 'spielen' (to play). 'Posaune üben' (to practice trombone) or 'Posaunenunterricht nehmen' (to take trombone lessons) are also common expressions.
Mein Bruder lernt seit einem Jahr, Posaune zu spielen.
My brother has been learning to play the trombone for a year.
The trombone is a versatile instrument found in many musical genres. You often hear it in classical symphony orchestras, big bands (jazz), and brass bands.
Im Jazz-Konzert gab es ein beeindruckendes Solo auf der Posaune.
At the jazz concert, there was an impressive solo on the trombone.
The verb 'posaunen' is derived from the loud, far-carrying sound of the instrument. 'Etwas in die Welt hinausposaunen' means to announce a piece of news loudly and often boastfully.
Er musste seine guten Noten sofort in die Welt hinausposaunen.
He had to broadcast his good grades to the whole world right away.
horn
'das Horn' and 'die Posaune' are both brass instruments and are found in orchestras, for example. That is why they can easily be confused. But they look and work differently: with a horn, the tube is strongly coiled, and the sound is often round and soft. With a trombone, you change the pitch using a long slide that you move forward and back. If you mean the instrument with the slide, 'Posaune' is correct. 'Horn' fits the coiled instrument without this slide.

Beim Üben zog Max die Posaune weit nach vorn.
While practicing, Max pulled the trombone far forward.
Im Konzert spielte das Horn eine ruhige Melodie.
In the concert, the horn played a calm melody.