The paper focuses on the basic lexicographic concepts underlying the structure of the Illustrated English-Serbian Dictionary of Musical Terms and Phrases with Serbian-English Index, a bilingual LSP (language for special purposes) single-volume dictionary published in 2015 by the Faculty of Arts – University of Niš. A record of more than 16,000 terms and phrases elaborated on 577 B5 pages in 9 pt Arial black and Ariel Unicode MS fonts, complemented with 580 illustrations, The Illustrated English-Serbian Dictionary of Musical Terms and Phrases with Serbian-English Index is tailored to meet the requirements for both communication-related and knowledge-related user situation, i.e. to serve as a point of reference for a rather wide span of users, including music students, teachers, professional musicians, translators, as well as music enthusiasts. The authors attempted at promoting several crucial decisions regarding the mega-, macro-, meso-, and micro- structure of the dictionary, each detailed in the paper.