From Wikipedia:
Love, American Style is an hour-long television anthology which was produced by Paramount Television and originally aired between September 1969 and January 1974. For the 1971 and 1972 seasons it was a part of an ABC Friday prime-time lineup that also included The Brady Bunch, The Partridge Family, Room 222, and The Odd Couple.
Each week, the show featured different stories of romance, usually with a comedic spin. All episodes were unrelated, featuring different characters, stories and locations. The show often featured the same actors playing different characters in many episodes. In addition a large and ornate brass bed was a recurring prop in many episodes. Charles Fox's delicate yet hip music score, featuring flutes, harp, and flugelhorn set to a contemporary pop beat, provided the "love" ambiance which tied the stories together as a multifaceted romantic comedy each week.
For its first season, the theme song was performed by The Cowsills. Starting in the second season, the same theme song was sung by John Bahler, Tom Bahler, and Ron Hicklin, (billed as "The Charles Fox Singers"), and was carried on for the remainder of the series, as well as most episodes in syndication.
In many ways the show initiated the "mini comedic soap opera" form used and "perfected" later on by Aaron Spelling for The Love Boat. While it lacked the connective threads that The Love Boat used, it generally told the same sort of "cotton candy" light emotional stories about underlying aspects of love, romance, and human relationships.