To master Giant Steps in every key, download the practice album on itunes: https://itunes.apple.com/us/album/really-big-steps-practice-audio/1400064382
This is a piano lesson on how to play the melody to Giant Steps with chord voicings underneath it. I try to explain the reasoning as best I can too. Hope you enjoy.
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Piano used in this video: Yamaha DC7X ENPRO (http://bit.ly/2vlY9gU)