Watch the Minor Pentatonic to Blues online guitar lesson by Jason Loughlin from Blues Connections: Minor
Let's take a quick look at how to incorporate our passing tones, looking first at the b5th. This note falls in between the 4th and the 5th. It also gets referred to as the blue note, as if the blues can be boiled down to just adding a specific note. The 6th is a whole step higher than the 5th, or you can also find it by going down a half-step from the b7th. Here's the formula: root-b3-4-b5-5-6-b7-root. Here are the intervallic distances: minor 3rd, whole step, half-step, half-step, whole step, half-step, whole step. Let's try this on a single string so we get a visual of the distances.
The b5th can be used as an approach note to the 4th or 5th and can also be used as a chromatic passing tone between the 4th and 5th. The 6th can be used to add an interesting color tone to a chord, an approach note into the b7th, or simply a passing tone between 5th and b7th.