… instruments, the sound of which is produced, or must be amplified, electrically (for example, organs, guitars, …
Explanatory notes
… instruments, the sound of which is produced, or must be amplified, electrically (for example, organs, guitars, … are fitted may produce faint sounds). In this respect, they differ from certain other instruments (e.g., pianos, … they may be equipped with an electrical sound pick‑up and amplifying device, are nevertheless independent instruments …