Written and first recorded by Laura Nyro (US #103 1966).
Also recorded by Lesley Gore (1969).
Hit version by The 5th Dimension (US #1/R&B #23/UK #16/CAN #3 1969).
From the wiki: “‘Wedding Bell Blues’ was written and first recorded by Laura Nyro in 1966 that would go to become a #1 hit for The 5th Dimension in 1969 and, subsequently, a popular phrase in American culture.
“Nyro wrote ‘Wedding Bell Blues’ at the age of 18 as a ‘mini-suite’, conveying the dual themes of adoring love and frustrated lament, and featuring several dramatic rhythmic changes.
“When Nyro first recorded ‘Wedding Bell Blues’ in 1966, she had arranged it in a spare, almost demo-like form*, intending this version to be a part of what would become her More Than a New Discovery album. However, producer Herb Bernstein would not allow Nyro use the arrangement, which ultimately led her to more or less disown the entire album.