There are three artists listed on Last.fm under the name of Sagittarius. 1) The first is a 1960s studio group from the U.S., created by Gary Usher - one the most influential producers of that time.
2) The second is a German neoclassic band. 3) The third is a progressive rock band from Norway.
1) Sagittarius was a late-60s studio group devised by producer and songwriter Gary Usher. Usher had been involved with music as a songwriter since the early 60s (including writing lyrics for some of Brian Wilson's earliest songs), and soon branched out into production work.