The Fourth Supplement of Popular Song Index covers song books published from 1988 to 2002. The arrangement of this supplement is identical to that of the preceding volumes in the series: (I) a bibliography of books indexed arranged alphabetically by author and coded by number; (II) an index by title, first line of song , and the first line of chorus; (III) a composer and lyricist index. Song titles, first lines of songs and first lines of choruses are alphabetized together in Part II, where the fullest information for a song is to be found under the title italicized entry. The title entry includes the names of the lyricist(s) and composer(s), the first line of the song, the first line of the chorus, and a number referring back to the bibliography.