As has been said on this page more than once, the late 80s and early 90s were replete with songs which have been left behind by radio. The entire library of songs for some artists are now forgotten, when once they ruled the airwaves on top 40 stations. While that hasn’t quite happened to the artist who went by the stage name Pebbles, some of her hits have hardly been heard on American radio since the 90s. For example, when was the last time you heard a station play “Giving You the Benefit”?
It’s not unheard of for a song to chart for multiple artists at the same time. It happened quite a bit in the early days of rock and roll. By the mid-70s, though, it was not nearly as common. There was one song, though, that charted for two different acts at the same time in 1976. Neither version gets much airplay now, of course, or this song wouldn’t be on this page, but I would imagine many people still remember Diana Ross’s version. But who remembers the 5th Dimension’s version of “Love Hangover”?