glockenspiel UK /ˈɡlɒk.ənˌʃpiːl/US /ˈɡlɑk.ənˌʃpil/ noun1 •A musical instrument of the percussion idiophone family of instruments. Like the xylophone, it has tuned bars arranged like the keys on a piano. It is smaller in size and higher in pitch than the xylophone, and the bars are made of metal instead of wood. formsglockenspiels