Though the challenge description specifies that the Fiber Wire should be used, using any of the garrotes (such as the Measuring Tape or Fishing Line) will complete the challenge.
The challenge's name is a reference to the first demo of Hitman: Codename 47, in which the Fiber Wire was named "Piano Wire."
Strangely, this challenge cannot be obtained in Untouchable, despite the fact you can find Fiber Wire and use them to kill Arthur Edwards.