It definitely won't give you much in terms of improvising lines I use it with my students. All the musical examples were written by the authors, there are no real jazz quotes, as in Levine. It does deal with a lot of what Levine skimmed over, but it's a dull read compared to Levine. (Levine's quotes are not great evidence for his theories, however.) The best jazz theory book seems to be Terefenko It's got lots of short solos over blues and standards, lines and technique exercises to learn in all