Question: Both John Davis and Blind Tom Wiggins are known for playing what musical instrument? 

Context paragraphs:
Omnichord: The Omnichord is an electronic musical instrument introduced in 1981 by the Suzuki Musical Instrument Corporation.  It typically features a touch plate, and buttons for major, minor, and 7th chords.  The most basic method of playing the instrument is to press the chord buttons and swipe the touch plate with a finger or guitar pick in imitation of strumming a stringed instrument.  Originally designed as an electronic autoharp substitute, the Omnichord has become popular as an individual instrument in its own right, due to its unique, chiming timbre and its value as a kitsch object.

Sound box: A sound box or sounding box (sometimes written soundbox) is an open chamber in the body of a musical instrument which modifies the sound of the instrument, and helps transfer that sound to the surrounding air.  Objects respond more strongly to vibrations at certain frequencies, known as resonances.  The frequency and strength of the resonances of the body of a musical instrument have a significant impact on the tone quality it produces.  The air inside the chamber has its own resonances, and these interact with the resonances of the body, altering the resonances of the instrument as a whole.  The sound box typically adds resonances at lower frequencies, enhancing the lower-frequency response of the instrument.

John Davis (album): John Davis is the twelve-song album released by former Superdrag vocalist/guitarist John Davis.  John Davis is his first solo recording since parting ways with Superdrag, and it conveys his newfound faith in God.

Electric instrument: An electric musical instrument is one in which the use of electric devices determines or affects the sound produced by an instrument.  Electric musical instruments are an example of electric music technology.  It is also known as an amplified musical instrument due to the common utilization of an electronic instrument amplifier to project the intended sound as determined by electric signals from the instrument.  Two common types of instrument amplifiers are the guitar amplifier and the bass amplifier.  This is not the same as an electronic musical instrument, like a synthesizer, which uses entirely electronic means to both create and control sound.

Song of the Shank: The publisher described the novel as following: At the heart of this remarkable novel is Thomas Greene Wiggins, a nineteenth-century slave and improbable musical genius who performed under the name Blind Tom.

Blind Tom Wiggins: Thomas "Blind Tom" Wiggins (May 25, 1849June 14, 1908, age 59) was an African American musical prodigy on the piano.  He had numerous original compositions published and had a lengthy and largely successful performing career throughout the United States.  During the 19th century, he was one of the best-known American performing pianists.  Although he lived and died before autism was described, he is now regarded as an autistic savant.

Institute of Musical Instrument Technology: The Institute of Musical Instrument Technology is the main professional body for all musical instrument makers, tuners and repairers.  It was inaugurated on 24 February 1938 and was incorporated on 13 March 1961.  According to its website, the Institute is the only professional qualification covering the whole field of musical instrument technology.

Samick: Samick Musical Instruments Co., Ltd. (Hangul: 삼익악기, also known as Samick) is a South Korean musical instrument manufacturer.  Founded 1958, it is one of the world's largest musical instrument manufacturers and an owner of shares in several musical instrument manufacturing companies.

Musical instrument: A musical instrument is an instrument created or adapted to make musical sounds.  In principle, any object that produces sound can be considered a musical instrument—it is through purpose that the object becomes a musical instrument.  The history of musical instruments dates to the beginnings of human culture.  Early musical instruments may have been used for ritual, such as a trumpet to signal success on the hunt, or a drum in a religious ceremony.  Cultures eventually developed composition and performance of melodies for entertainment.  Musical instruments evolved in step with changing applications.

John Davis (pianist): John Davis (born October 22, 1957) is an American classical pianist, concert performer, recording artist, and historian.  Born in Chapel Hill, North Carolina and raised in Providence, Rhode Island, Davis now lives in Brooklyn, New York.  He has specialized in reviving the forgotten music of several 19th Century African-American pianists, including Blind Tom Wiggins and Blind Boone.  He has recorded albums of works by both composers for the Newport Classic label.

Supporting paragraphs: John Davis (pianist) Blind Tom Wiggins
Answer: the piano