In the game I am running, there are several characters who are bards with the Windsinger feat (Stormwrack p94). The players and I have been debating what qualifies as a wind instrument for purposes of using them to activate this feat, as this feat specifies:
You can use song or a wind instrument to compel the winds to obey you.
This is a somewhat high-tech black-powder age-of-sail campaign, and there are more instruments available than are specified in the Players Handbook p79.
In particular, we were debating squeezeboxes such as the accordion or concertina, and bagpipes. All of these instruments rely upon air pressure to function, and are aerophones, but the squeezeboxes are played by using muscular effort to provide air pressure rather than blowing into the instrument and the squeezeboxes have keys or holes.
What instruments available circa 1800s real-world Earth would be considered suitable for purposes of activating the Windsinger feat, and why?