$500+ gift ideas for oboist?

I hope this question is ok, but I’m looking to buy something practical for my partner who plays the oboe. I literally don’t know anything about music unfortunately, and hope this community can help give me basic pointers.

They have a professional grade oboe equipment already (like a $>7000 oboe) and they make their own reeds. I don’t know anything about oboes though, and I don’t want to buy them something that they’d never use.

Are there good practical gift ideas for an oboist? I considered getting them rare sheet music or something, since they seem to like classical music, jazz, or big band style songs, but… I think there’s a very high chance I’d buy them music they don’t care about. I’d appreciate any ideas!