Blues Guitar Lick: D IV Chord In A Blues

Today's blues lick uses notes of a D chord. You can use it over the IV chord in a blues in A. Here's the lick:

e---------------------------
B---------------5s7~~~~~~~~-
G-----5h7--5h7--------------
D--7------------------------
A---------------------------
E---------------------------

The lick starts on a A, the 5th of the D chord. Many guitar solos start on the 5th. It moves on with a couple of hammer-ons from the b7 to the root D note. The lick finishes with a slide up from the 2nd to the maj 3rd of the D chord.

The notes of the D chord used are all from either the A minor or major pentatonic (the final F# is the 6th of the A maj pentatonic). The 3rd-ness of this note supports the harmony and makes the D chord sound.