When it first appeared in the 1930s, FM radio was a technological marvel, providing better sound and nearly eliminating the static that plagued AM stations It took another forty years, however, for FMs popularity to surpass that of AM In Sounds of Change, Christopher Sterling and Michael Keith detail the history of FM, from its inception to its dominance (for now, at least) of the airwaves Initially, FMs identity as a separate service was stifled, since most FM outlets were AMowned and simply simulcast AM programming and advertising A wartime hiatus followed by the rise of television precipitated the failure of hundreds of FM stations As Sterling and Keith explain, the 1960s brought FCC regulations allowing stereo transmission and requiring FM programs to differ from those broadcast on coowned AM stations Forced nonduplication led some FM stations to branch out into experimental programming, which attracted the counterculture movement, minority groups, and noncommercial public and college radio By 1979, mainstream commercial FM was finally reaching larger audiences than AM The story of FM since 1980, the authors say, is the story of radio, especially in its many musical formats But trouble looms Sterling and Keith conclude by looking ahead to the age of digital radiowhich includes satellite and internet stations as well as terrestrial stationssuggesting that FMs decline will be partly a result of selfinflicted woundsbland programming, excessive advertising, and little variety