Theorie:

To speak music, you need some general terms. Part 1
 
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Drum – Trommel, Schlagzeug

Guitar – Gitarre

Harp – Harfe

Musical instruments – Musikinstrumente

Musician – Musiker(in)

Opera – Oper

Operetta – Operette

Orchestra – Orchester

Organ – Orgel

Percussion – Schlagzeug

Piano – Klavier
Quellen:
http://study-english.info/
https://www.theodysseyonline.com/music-never-again