This reference work provides a structured guide for vocal performers seeking repertoire. John Nix, an established figure in vocal pedagogy, compiles a comprehensive catalog of songs, categorizing them by genre and arranging them alphabetically by title. The book addresses the practical needs of singers by detailing available keys, vocal ranges, tessitura, difficulty, and voice types for each piece, alongside textual summaries and notes on genre and language.

This reference book is designed to be a practical tool for vocalists and educators. The detailed categorization and indexing suggest a focus on usability for singers preparing for auditions, recitals, or study. Its comprehensive nature aims to streamline the repertoire selection process by providing essential data points for a wide array of vocal pieces.