The year 1973 saw a number of significant events in radio broadcasting history.
4 June – KFMH flips from its beautiful music format to alternative rock, using the slogan "99 Plus." The first song is reportedly "I've Seen All Good People" by Yes. The new station quickly gains a cult following and a reputation for playing music and showcasing genres and local artists ignored by other stations.
KWNT-FM (106.5 FM) of Davenport, Iowa switches from country music to beautiful music and light easy listening, with the new call letters KRVR (with the slogan "K-River"). The new format will become the signature of the frequency for the next 22 years, but leaves the Quad-Cities market without a full-time FM country music station for most of the next five years. KWNT's AM station (1580 AM) remains country.