The instrument described is a clavichord.
Although not very popular nowadays, it was important between the 15th and the 19th century. In popular music, variations of it can be found in songs by artists such as Stevie Wonder and Bjork, but they mostly used the electric version of the instrument.
The rhythm section usually consists of a bassist, pianist, and a drummer, but it may also include a guitarist,and a percussionist
I don't know much about cones, but here is what Google said.
Answer:
ACED
Explanation:
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