Hi, Me (you). Check out this excellent book. It is long and narrow and fits easily in a gig bag.
"Every Musician's Handbook" AMSCO Publications, 1984, 63 pages, $4.95
Not only does it have an extensive glossary, it also contains information on rudiments such as scales, keys, intervals, chords, time and notation. Also explains harmony, counterpoint, and orchestration. I doubt you'll be needing counterpoint and orchestration for awhile, but the rest of the book is a concise exploration of the basic concepts you will need.
Other books by the same publisher in the long and narrow format you might find helpful are "Beginning Bass Guitar", "Beginning Bass Scales" and "Chord Bassics". Jason Oldsted
[This message has been edited by JasonOldsted (edited July 30, 2000).]