The traditional singing competition system is

The simplest thing is that 24 people are divided into 8 groups with 3 people in each group.

Three people compete together, each with a song, and then whoever scores or votes the most will be eligible.

But this will lead to institutional problems such as death groups.

I personally think

24 people were divided into 6 groups with 4 people in each group.

Or each person has a song, and the six groups with the highest scores are the first to advance.

Then choose the two ranking points with the highest score from the second group of six groups.

I hope this helps.