The album reached No.3 in the UK Albums Chart, and remained in the charts for 32 weeks having been bolstered by the UK Top 10 success of "Follow You Follow Me", which also became Genesis' first hit US single. ...And Then There Were Three... reached No.14 on the US chart, becoming their first Gold (eventually Platinum) album there.
While many of the songs were still progressive in terms of instrumentation and lyrics, the arrangements went from the more classical, movement-style composition of previous albums to the more standard verse/chorus/bridge format of popular songwriting.
This was the final Genesis album to use a Mellotron, which is used on just one track, "Many Too Many".