Z

Zero Level
This is a standard reference audio level used when discussing relative levels. Commonly the zero level is chosen to be 1 mW. This corresponds to 0.775 volts rms across a 600 Ohm resistance.

Zither
Musical instrument composed of strings mounted upon a resonate frame, strings can be plucked with fingers or struck using small mallets.

Ever since the Beatles, the concept of lovable mop tops, it's a bit of a fantasy, but it's a lovely idea that people make wonderful music and live a wonderful life being friends together. Sadly, life isn't quite like that.”
  Nick Mason