Auto-Key - App for figuring out out the key of a song

Fellow BluesHarmonica.com student, John Stranack, just shared with me an app that he uses to check the key of a song (he first does it by ear, and then double-checks it with the app). The app is called AUTO-KEY (by Antares Audio Solutions) and it works quite well. Thanks John!

Here's the lesson on how to do it yourself (use the app for checking your findings, not as your primary way of figuring keys out... we need that skill).

Ear Training Study 1 - Figuring out the Key of a Song: https://www.bluesharmonica.com/lessons/ear_training_study_1_figuring_out_key_song