Modal / Power Chord?

[loonsailor]

Is there a way to specify a chord with no 3rd? In rock / pop, they'd call it a power chord, in bluegrass a modal chord. For example, in something like Clinch Mountain Backstep or Reuben, the I chord is modal, neither major nor minor, though the melody plays a m3 against it.

 

[dflat]

There is 5, eg G5.
You find it in the chord quality menu list or type it in.