This study of musicology develops computer programs, data, and procedures for using the computer in the field of thematic indexing. The thematic index is a means of identifying anonymous works, arranging and cataloging the works of a particular composer or genre, and collating the varied manuscript and printed sources of a particular form or style. Automated procedures make it possible to carry out more sophisticated analyses of larger repertories than is possible by hand. The opening melodies, or incipits, from various 16th century repertories were coded into computer language using the Ford-Columbia Representation method. Programs were written to analyze, extract, and print data in varying formats from the more than 30,000 incipits encoded. Conclusions are (1) that thematic indexing can be carried out successfully on a large scale by use of the computer, (2) the idea of a data bank of research materials has great value, (3) ways must be found to incorporate the factor of rhythm into future studies, (4) a means of printing the actual music as part of the computer format is needed, and (5) further investigation is needed to determine the most effective ways to publish the results of automated thematic indexing. (TT)