1) Keyboard percussion 
The marimbaphone is an obsolete tuned percussion instrument, developed by the Deagan company of Chicago, Illinois, U.S. in the early 20th century. The marimbaphone had shallow steel bars arranged chromatically with a tube resonator under each bar. Its timbre was similar to the celesta, and it was used mainly by marimba bands and as a solo instrume...
marimba with steel keys