You absolutely should give the Metallica t-shirt shirt if you have it. Failing that, a Nirvana one.
Books! You can never have too many. But theyāre not cheap. And reading through the same ones again and again can become a little repetetive (and thats taking account of additional ones we get from the library). Thereās some corkers to be had.
Stackable cups and donut rings on a pole are absolute essentials, so make sure theyāve got those in the house.
Or, if you wanna go for the instrument angle, these fun friends:
Or this accordian hedge ledge:
Hapeās little vehicles are nice, e.g.:
https://www.hape.com/uk/en/toy/toy/E0052
Pull along wobbly snail (or jumpy frog):
http://plantoys.com/product/pull-along-snail-2/
Or some sorta shape sorter?