After playing bass casually and occasionally for decades and acquiring a used acoustic bass guitar for recording a while back, I joined a weekly classic rock/pop/country jam 2 years ago, bought an electric bass, and have been working on improving my playing. After working through Roger Filiberto's "Electric Bass Position Studies" 3 times and nearing the end of Jon Liebman's "Bass Aerobics," I went looking for another book to further my progress and came across the "Bass Line Encyclopedia." I'm still very early in the book (p. 19 in Chapt. 1), but so far am finding it extremely useful. The introductory "Notation and Theory Review" section is concise and packed full of useful information, and the suggestions for approaching the learning process are spot on. Each subsequent chapter covers a different style of playing (e.g., blues, rock, jazz, etc.), and while some of the exercises appear simple at first glance, they are deceptively rich in content and value. I have already picked up several invaluable blues progression bass lines, just in the first half of the first chapter. This book is an essential reference for any bass player's development as a musician. I only wish I had come across it a year ago!