The ‘happiest’ sounding of the modes, the Ionian is identical to the major scale, so it’s highly likely you’re already playing it on guitar ... a mode – B Dorian, C# Phrygian and ...
In some ways it’s an easier scale to get a handle on as the dissonant notes jump out immediately, unlike, say, the Dorian mode where the major 6th is a more subtle tension. The tension ramps up ...