This show is enjoyable (music trivia with a touch of comedy), but I don't actually watch it that often. However, I am a huge music lover myself, and am always ready to answer the questions (sometimes even before the people who are on the show actually do).
[Maybe they should get me on the show one day...]
There are a number rounds, but each round is not always shown in every episode. This is mainly because the show only typically goes for about half an hour.
Many famous people (mainly Australian singers and comedians) have appeared on this show during its run (Barry Crocker even once appeared on the show and had to sing the TV tune to "Neighbours" [which he originally sang when "Neighbours" began] but had to substitute the lyrics to the words from a book on poultry).
It is obvious that everyone involved has fun making this show, and the show also has an easy-going nature. Adam Hills [the host] usually lets the others talk, instead of telling them to be quiet, like on other game shows.
If you are looking for good light entertainment, look no further.