Your media keys, hooked to the app you meant.
Hook your Mac's media keys — and optionally volume — to the one app you choose, so macOS can't redirect them to Apple Music, YouTube, or whichever player it remembers.
The signed & notarized, ready-to-run app with all Beamhook 1.x updates. Same complete app as the source; your purchase supports continued development.
The code’s open — you can see exactly what handles your keystrokes. Clone it and build in one step; the README has the details.