Wikipedia tells us that the band Three Dog Night had 21 Billboard Top 40 hits between 1969 and 1975, with three hitting number one…and this was one of them: "Joy to the World," written by Hoyt Axton. Wikipedia also details the extraordinary number of performers who have at one time or another been part of Three Dog Night.
The band was huge in its day. In December 1972, they hosted the first New Year's Eve special that Dick Clark produced. It was called Three Dog Night's New Year's Rockin' Eve. This was for NBC and Clark did one more for that network — New Year's Rockin' Eve with host George Carlin unmentioned in the title — before signing a long-term deal with ABC. The shows were eventually titled Dick Clark's New Year's Rockin' Eve.
Getting back on topic here: Amazingly, Three Dog Night — which first released records in 1967 — "Joy to the World" was 1970 — is still performing. They broke up in 1976 but got back together in some form in 1981 and they're at the Seminole Casino Hotel Immokalee in Immokalee, FL this Saturday night and Sea World in Orlando on Sunday. What's more amazing is that the current roster includes two of the original members. One of them, Danny Hutton, got his start in the record business with Hanna-Barbera records.
Here they are on some show in 1971 lip-syncing (with no microphones in evidence) to the record, which is still popular…