Serfty, I am sure you are correct that there is no discount for musical instruments, the (possible) ambiguity is that every other item in the list you link to IS eligible for the discount. See http://www.airnewzealand.co.nz/overs...s-from-26may10 . That is the reason I asked in the first place.
Anyway, let's put this down to wishful thinking on my part, and not waste any more pixels on a matter of $20.
Cheers guys.