Match the percussion instrument with its description.
1. bass drum a. large vertical drum struck from either side with a covered mallet
2.gong b. pitched instrument with tuned wooden bars laid out like piano keys 3.xylophone c. large pitched drum played with covered mallets
4.timpani d. suspended metal disk struck with a large mallet

Silverpoint is a. a technique using the blackish residue of impure carbon obtained by removing water from animal and vegetation substances. b. a technique involving the use of a metal point, and a thin silver wire, popular in the 14th and 15th centuries. c. a printmaking technique born from crayon manner that imitates the appearance of chalk lines. d. a technique used since the 16th century involving a stick filled with either colored or black graphite, a heated mixture of carbon and clay