A video showing off a POWER tools for finding a key, scale, and chord progression from any song(or sample) in SECONDS. It's called "deCoda" by zplane and it works on both Windows and MacOSX! This audio analyzing software uses the Elastic version 3 algorithm in the most clever way! It can detect bpm, has it's own piano roll, and can export MIDI too. It's the best music theory tool for learning popular songs and how they progress! How do you feel about this software? Please leave a comment below.