Translation:The young artists play the violin in front of the school.
Exactly! To express playing a musical instrument we can take the name of said instrument, and make it into a verb.
- trombita (trumpet) -> trombitál (or trombitázik)
- orgona (organ) -> orgonál (or orgonázik)
- zongora (piano) -> zongorázik
- furulya (recorder) -> furulyázik
- dob (drum) -> dobol
In my experience, the definite article is used in English when referring to playing an instrument, even when you are not referring to a specific violin/piano/guitar etc. -- one talks about "being able to play the guitar" etc.
So this is not an instance where the use of the article can necessarily be copied from another language which does not have this usage.