I came across this site during the last decade (about 6 months ago), and have found it to be very helpful as a learning and study tool as I learned the different keys. It not only displays the scale of whatever key you select, it also shows the diatonic triads, pentatonic scale, and the relative key. I thought I’d share it here if anyone is interested. I’m kind of a music theory geek, so I love stuff like this.
Needless to say, there’s no substitute for study and practice. This is just a learning aid.
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