I have both the Spittin' Feathers and the Lovett Williams tapes, plus a video "Mouth Calling 101" from Lohman, I think. There is also a CD I got when I purchased a turkey hunting videotape that described how to use locator calls, etc, but I can't remember the name of it, only know the CD is not a circular CD, as it was cut to fit the back side of the videotape box, and it still plays, though not in my truck's CD player.

I would recommend the Spittin' Feathers tape, too, though I think there could be improvement in the currently available instructional tapes.