I Know My First Name Is Stephen
I always think that "three-minute format" reason is a lame excuse. Maybe in the sixties but not by the seventies. There are plenty of singles over three minutes that did extremely well.It really should have been a single back in 1973 - regardless of radio preferring songs around the 3 minute mark, I still suspect that if a song was good enough, it would get the airplay regardless (surely not every hit released in the early 1970s stuck to these timing strictures).
Had they released it in 1973 (or even in their non-album year of 1974), I think it would have done tremendously well on the charts. It's one of the most beautiful of all their recordings and is tailor-made for Karen.