Actually Newtricks. There are some ((Tricks)) you can use to get a Northern Mockingbird closer.
I have recently downloaded some bird calls on my phone and can honestly tell you that they work like a charm to entice some birds to come close enough.
Now I have to admit, that I was near the bushes or shrubs or trees that I already knew they were in or around. In particular, Northern Mockingbirds, Spotted Towhees, and American Robins are very interested in the sounds coming from my phone. Sometimes I have the phone in my breast pocket, pants pocket, or simply lay it on the ground or a branch.
My wife just downloaded an app on her Iphone called Merlin ID (it is free but not yet available on Android). It works well other than it does not loop the recordings.
On my Android phone I have 16 different birds with at least 4 calls for each in folders. I pick a specific bird and continuously loop/shuffle the songs.
Just my best guess, but I have had Towhees, Robins and Mockingbirds come within 10 yards of me.