Watch the Upper Leading Tones online guitar lesson by John Goldsby from Upright Bass Handbook
Now let's play the Bb blues with upper leading tones at a faster tempo. As you've noticed when you played the slower playalong track, the connection of the notes in a crucial factor in determining the groove.
The trickiest part of this exercise is the 2nd chorus, which uses two upper leading tones. This is where you have to shift out of the half position, into the first position, and back to half position. Make sure these shifts are accurate, and that you use the fingering indicated. Don't use electric bass fingerings! Most of these notes are in the half position, the lowest position on the bass. But for some of the notes, like the Db in bar 8, and all of bars 9 and 10 of the first chorus, you'll have to move your left hand up a half step into the first position.
You should keep your left hand relaxed and you'll be able to reach all of the notes without moving around very much. Just be aware of which position you're working in, half position or first position. You can look at the position of your left hand, and also listen to the way the notes flow. The coordination between the left and right hand is an important factor in creating the groove, and accurately nailing the notes.