Phonolog or PhonoLog was a recorded music directory that listed artists, currently available albums, and songs, focusing on popular music. Each directory contained thousands of loose-leaf pages and listings — 11,000 titles as of 1968. These large directories with their familiar yellow-gold pages were often located in record stores and libraries; they were used by store customers, library patrons, radio music directors, radio DJs, and anyone else who needed a comprehensive resource of recorded music. A nearly complete volume is on file with the Library of Congress for historical songwriter, album, and title research.