The crossword solution for the term 'Glockenspiel Relative' is Celesta, a seven-letter word. The Celesta is a musical instrument that is related to the Glockenspiel. It is a keyboard instrument that produces a soft, bell-like sound. It was invented in 1886 by Auguste Mustel and is similar to a piano in that it has a keyboard and hammers that strike metal plates. The Celesta is often used in classical music, film scores, and popular music.