One VERY useful technique, is to add the Major 3rd. to the Minor Pentatonic, or the Blues Scale. Here's some examples, below.
Note: Usually you always go from the Minor 3rd. to the Major 3rd. Even when descending. So, when descending (in E), skip past the G#, go straight to the G, and then UP to the G#. Then, continue descending.
This really nails the sound of the E7 chord.
Adding the Major 3rd. to the E Minor Pentatonic Scale
-----------------------------0-3/4-0-3/4-0----------------------------|-------
------------------------0-3-----------------3-0-----------------------|-------
-----------------0h1-2--------------------------2-0h1-----------------|-------
------------0-2---------------------------------------2-0-------------|-------
--------0-2------------------------------------------------2-0--------|-------
-0-3/4---------------------------------------------------------3/4-0--|-------
E minor Pentatonic, with added Major 3rd.
------0----2--0----------- |----------3--------|--0---------|-0----------|--------
------0----2--0----------- |------3-5---3h4---|----1/2----|------------|--------
-----0h1--2--0h1---------|-2/4-------------4-|--------2--|---0h1------|--------
---2-------------- 2-------|--------------------|------------|--------2---|--------
-------------------------- |--------------------|------------|------------|--------
-------------------------- |--------------------|------------|------------|--------
E Blues Rhythm Lick B7 A7 E7
--------------7---7-----------------------------------------------------------
--------------8b--8b----------------------------------------------------------
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Classic "Blue 3rd." Train-Whistle lick, in E. Bend the G note slowly,
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and 1/2 way to the G# note.
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