These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Amazingly, every episode of the series so far has had a song sung by a different member of the gang. But the best one by far is Nelson's song "Breaking Up Is Such A Faff" in Episode 6.
Not quite every episode. In episode 5, Nelson tries to sing to Destiny about his love for her, but she ends up being dragged away by Gary shortly after the song begins. However, to make up for this, he sings lead on two songs across the whole series instead of one like everyone else.