Many of these rounds have proven more popular than others. "Substitute" was used consistently throughout the early history of the show appearing in almost every episode (although later in the programs run was sometimes excluded in favour of "Cover Versions" occasionally), whereas some were only used every now and then and others used much less. Some other segments which proved to be popular early in the show's history but have been used less or even abandoned later : "Musician or Serial Killer" and "Bottom 100" were both commonly used early in 2005, but are rarely later. Some games were also introduced later in the series, and occasionally a game will be temporarily changed in some way (e.g. Musician Or Serial Killer was changed once to ARIA winner or Audience Member on the ARIA special episode).