<?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_es">conceptos acústicos</topic></authority><related type="narrower"><topic>absorción del sonido</topic></related><related type="narrower"><topic>sonido</topic></related><related type="narrower"><topic>eco</topic></related><related type="narrower"><topic>transmisión acústica</topic></related><related type="narrower"><topic>altura tonal</topic></related><related type="narrower"><topic>resonancia</topic></related><related type="narrower"><topic>emisión acústica</topic></related><related type="narrower"><topic>timbre</topic></related><related type="narrower"><topic>silence (traducció pendent)</topic></related><related type="other"><topic>propiedades acústicas</topic></related><related type="other"><topic>acústica</topic></related><related type="broader"><topic>conceptos físicos</topic></related></mads>