I wouldn't mind if more instruments were added, but I would really like the opportunity to play a non-musician Bard, as described in the linked thread. That means

  • In the Character Creation screen, add another starting "instrument" option : None/Voice.

  • In the Perform action, add Performances that are non-musical, such as story-telling or reciting poetry. Or dancing, juggling, prestidigitation tricks, etc.