The guide offers concise, non-technical explanations of symphonies, overtures, and tone-poems, arranged by composer, that orient concert-goers to the illustrative or poetic intentions behind each work. A preface argues for knowing a composition's programme when it is central to the music; individual entries summarize a work's descriptive basis, thematic outline, and salient orchestral effects without indulging in speculative interpretations. Coverage ranges from Beethoven through late-nineteenth and early-twentieth century composers and selects items likely to appear on contemporary orchestral programs, providing practical background to enhance informed listening.