While taking a morning walk in a neighborhood park the other day, I heard the "sweet-sweeter-sweetest" song of the Maggie. He was in a bad spot relative to the sun. So I went back in the late afternoon, taking my Bluetooth mini-speaker. I hung it near a chosen perch in good light, and he popped up almost immediately. This was one of the first frames. I also got a few almost-perfect side views, but with the slightest head turn away which would upset the HA wonks. My experience with audio is that it needs to be used sparingly, to keep from distracting the bird from his essential tasks, and because the bird will soon tire of playing the game.
D500, Sigma 150-600C @ 600mm, ISO 2500, 1/800s @ f/6.3 manual, HH.