Watch the Sharp Lydian online guitar lesson by Brad Carlton from Chord Studies: Modal Progressions Vol. 1
3 of the chords in this set of A Lydian harmony Quartal chords have the #4 in them. Can you hear which ones? Listen until you can identify that note anytime it appears. That is the note that makes this Lydian, so being able to pick it out of the chord will go a long way to helping you identify modes just by their sound.