Answer
Tuned percussion instruments, such as the glockenspiel, xylophone, and vibraphone, were frequently employed by Messiaen in his orchestral compositions. He recognized their unique timbral qualities and exploited their ability to create shimmering, ethereal soundscapes. By incorporating these instruments into his works, Messiaen expanded the traditional orchestral palette and introduced a distinctive sonic element that became a hallmark of his musical style.