Watch the Sunny Days online guitar lesson by Jon Finn from 30 Melodic Modal Rock Licks You MUST Know
This lick features a small A major chord arpeggio along with the #4th degree of the scale (D#). Since the characteristic note of A Lydian is D# (#4th degree), this note is strongly featured in the first half of the lick.
The second half of the lick gives a musical "answer" to the first half over the B/A chord (B chord with A bass note). Even though the lick is based on a chord shape, it's important to play each note, one at a time, to be sure that the notes don't run into each other; especially when using an overdrive tone.