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”?