Finding Seconday Dominants

To add variations you can replace each degree of the scale with another chord called the secondary dominant.

On Scaler to find the secondary dominants go to the the MOD page,:

Having decided on the key you are using (in this example G major scale so the key is G)

go to the MOD page, and slect secondary scale from the drop-down menu.

Then select your key by clicking on it for the secondary scale. Because my original key was G, I have clicked on G again to display the secondary dominants.

Hope this helps

PS If the pitch of the secondary dominant does not fit your harmony try editing the chord on the Edit page

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PPS Better still edit the new chords on the CHORD page