The songs of Puccini provide another approach to understanding the composer's musical development. The objective of the study is twofold; first to provide a discussion of the musical style of Puccini's songs; and second, to show how Puccini utilized and integrated the preexistent material into the operas. The songs are grouped and characterized in three stylistic periods. In each period, Puccini was concerned with different issues in text setting. They anticipated or corresponded to the musical style of his operas, and this is evident by his use of the earlier songs in the later operas. Three examples of such cases are examined. The details involved in the transformation of self-borrowing are illustrated in terms of recomposition, expansion of the vocal line and orchestration. Each case illustrates the textual and/or musical consideration by Puccini of the original source for the new dramatic context of the opera. The borrowed material, often incorporated with new themes and expressive orchestration, blooms as an effective dramatic piece of music in his operas. In addition to the lecture recital, based on the dissertation and given on June 23, 1997, three other public recitals were performed. The first, on February 27, 1989, included works of Schubert, Brahms, Wolf, and Strauss. The second program, an operatic performance of The Queen of Spades by Tchaikovsky, was given on April 20, 1991. The third recital was performed on February 20, 1995, and included works by Handel, Mozart, Stravinsky, Schubert, Poulenc, and Turina.