By the mid-1970s, WLS became conservative about introducing new songs, and many record promoters referred to the station as the "World's Last Station" to add new releases for airplay, usually only after the songs had reached the top 10 on the "Billboard" Hot 100. However, in 1974, the station started playing the track "Lady" by the Chicago band Styx from an older album of theirs, resulting in other stations around the country adding the song and making the track Styx' first national Top 40 hit.