I'd love to see a greater variety of instruments.

Shamisen Guiro Cornet Bugle Dulcimer - Suggested by Dice Harpsichord

Edit: Wobble Board (or Wobbleboard) - known to be used by Rolf Harris - Apparently we have one. Zither We have one, oops sorry!

YES

How about Simsimiyya Dizi/Bamboo Flute Pipa Suona Quqin Pungi Shehnai Taiko Drum Street Organ Sitar Biwa

Also, since we're going with zither and that was originally what I was going to suggest, more Chinese based instruments. It'd fit in with Shengui Guo

Erhu

also, all the instruments in this. XD Chinese instruments

There is Chinese in the names, but it comes with the english pronunciation as well.

We've already got a zither:

I'd love to see a dulcimer, though.

I've updated thanks, didn't check that one in search. I love Dulcimers the word just sounds cool.