Watch the Approaching the IV online guitar lesson by TrueFire from Play Blues Guitar 5: Lick Vocabulary
Approaching the IV - Lick 6 is a video guitar lesson presented by Anthony Stauffer and is sourced from 50 Slow Blues Licks You MUST Know.
You can add a lot of polish to your soloing by playing licks that highlight the changes of the chord progression. In this lick, B.B. gently accents the transition to the IV chord at bar #5, then follows the accents with a wide bend, adding just enough tension to the lick.