What if you wanted to pep up your progression by ... be labelled as I – ii – iii – IV – V – vi – viiº, where upper case Roman numerals denote major chords and lower-case numerals ...

Using MIDI over USB, it plays the I-V-vi-IV progression in any key. It plays in chord mode, arpeggiated mode, or mixed mode at any sensible tempo. You can check out a video of the 4chord playing ...

Step 8: So for example, a IV-I-V-vi progression in F major works out as Bb-F-C-Dm, because the IV chord in the key of F major is Bb major, the I chord is F major, the V chord is C major and the vi ...