 The song was banned in Singapore in 1970 due to "alleged allusions to drugs"; the ban extended to entire albums including the song, such as "Chicago 18".In 1993, the ban on this song was lifted, along with long-time bans on songs by other artists such as the Beatles, Bob Dylan and Creedence Clearwater Revival.In a 2013 interview, Robert Lamm said he composed "25 or 6 to 4" on a twelve-string guitar with only ten strings — it was missing the two low E strings — and that he wrote the lyrics in one day.