<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">calliope whistles</topic></authority><related type="other"><topic>calliopes</topic></related><related type="broader"><topic>whistles</topic></related><variant type="other"><topic>calliope whistle</topic></variant> <note xml:lang="en"><![CDATA[ Whistles that are attached to barrel-operated, steam calliopes. The volume of calliope whistles dictates their pitch. Calliope whistles may also be detached from the instruments, and historically were sometimes placed on trains or ships as steam whistles. ]]></note></mads>