Watch the Example 2 online guitar lesson by Brad Carlton from Guitar Lab: Boogie-Woogie
This example is a three voice passage. The 1st voice moves 1, 2, b3, 2. The 2nd voice moves 5, 6, b7, 6 and the 3rd voice pedals the root. You could view this example as fourths out of A dorian over an A bassnote. You will probably recognize this lick as a frequently used rhythm guitar phrase.