My New Piano
https://www.instructables.com/Arduino-Tinfoil-Piano/
Step1 Make the Piano Key
Cut the wire and use double side tape to tape it on a side of foil, repeat after you have 8 keys. Then stick all 8 keys on the cardboard, also make sure there is a space between the keys, because they can not touch each other.
Step 2 Assemble the Circuit
You need to have seventeen wires (included the 8 wires on the piano circuit), and eight resistors to finish this step.