Watch the The Dom 7 Bebop Scale online guitar lesson by Sheryl Bailey from 50 Essential Bebop Licks You MUST Know
The dominant 7 bebop scale is in play here. It is a scale with a passing tone between the root and b7. By employing it, the strong chord tones stand out and you achieve greater harmonic clarity and you really begin to play the changes. This line also uses an Abmaj, a common chord substitution.