MMM Melbourne had a short-lived more pop format around 1990-91, I remember hearing Mariah Carey’s hit “Vision of Love” and Amy Grant’s “Every Heartbeat” on it (both songs are staples at TT-FM/Mix FM) at that time. They had “Top 8 at 8” which played poppier tracks (most requested) and in 1991 carried Rick Dees’ Weekly Top 40 from the US on Saturday nights.
And in early 1996 when Barry Chapman ran MMM they had a cross between JJJ and 2DAY FM playing some edgier music, they even poached Andy Glitre and his JJJ show “The Rhythm Method” (which played dance music) across to MMM and also Richard Stubbs’ breakfast show from Melbourne was networked to Sydney. It was all short lived, and ratings plummeted, Melbourne at least returned to its more familiar classic/modern rock format shortly after.