Watch the Street Walk online guitar lesson by Freekbass from 50 Freekbass Licks You MUST Know
This is kind of a hip-hop influenced melodic line that moves between D minor and C major. I go back and forth between the high octave around the 12th fret, down the the low octave in first position.
Pay attention to not just the notes I am playing, but the phrasing and articulation of the notes. For instance, when I go between the E on the 2nd fret of the D string, to the C on the A string, I kind of hang on that C for as long as I can until the next note givng a tension and release feel.
Since the line is the same collection of notes with each pass, you can phrase it a little differently each time to keep it interesting to the listener.