found:New Grove dict. of mus. WWW site, May 5, 2005:under Mallet (Keyboard percussion instruments such as the vibraphone, marimba and xylophone are today normally spoken of collectively as "mallet instruments")
found:New Grove dict. of mus. WWW site, Nov. 2, 2007:under Metallophone (generic term for percussion instruments that consist of a series of tuned metal bars arranged in a single or double row)