It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

ZenScript
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import crafttweaker.api.item.component.Instrument;

Instrument extends Record. That means all methods available in Record are also available in Instrument

Name	Type	Has Getter	Has Setter
Name commandString	Type string	Has Getter true	Has Setter false
Name range	Type float	Has Getter true	Has Setter false
Name registryName	Type ResourceLocation	Has Getter true	Has Setter false
Name soundEvent	Type SoundEvent	Has Getter true	Has Setter false
Name useDuration	Type int	Has Getter true	Has Setter false