People Effects on their songs

I have not done mine yet! ??
I realized that almost everybody had this random noise right in the middle of their song. Hope's song had like a burp. Everybody's song had many effects mixed in their songs. Only a few had a constant beat. Most of the people did put a lot of effort, although I saw some that were not complete. I did not hear in any song a underlayer beat. All of the effects were really random. I heard lots of of tone effects, that didn't really connect well with the beat of the song. I thought that all of the songs had to be 90 seconds long. Some of them were way shorter than 90 seconds. There were also some that were way longer than 90 seconds. All in all I thought they were not bad at all.