Recorded sound has pervaded nearly every facet of modern life—not just popular music, but also mundane office dictation machines, radio and television programs, and even telephone answering machines. Just as styles of music have evolved, so too have the formats through which sound has been captured—from 78s to LPs, LPs to cassette tapes, tapes to CDs, and on to electronic formats. The quest for better sound has certainly driven technological change, but according to David L. Morton, so have business strategies, patent battles, and a host of other factors.