SHELF Projects (1) Out of Tune and losing video

This video on the top is about tune ,and that video below is the practice part of our losing video last week , I found it in my phone today.

I am not sure if I said that "out of tune" in the video is correct .

words of this song is easy for me --->that lyric seems easier for me than others.

sing-sang-sung

That pronunciation of tune never correct in this vidio .o(T_T)o

If somebody want to try it again ,that wear an earphone to listen a song ,and sing that song at the same time ,then check that if you out of tune ?