This was a joke, meaning that others could get paid for singing well, but if you sang badly, it would kill the audience. This was an exaggerated metaphor used to describe how bad singing was. It was not a literal meaning, but a humorous way of expressing it.
Well, if it's a 'sing sing true story', it could be about the history of the Sing Sing correctional facility. Sing Sing has a long and complex history. It could be about famous inmates who were held there, like how they coped with prison life, the conditions they were in, or how their time in Sing Sing affected their lives after release. It could also be about the staff and their roles in maintaining the prison, and any significant events that took place within the prison walls over the years.
The title 'Sing Unburied Sing' could be chosen to evoke a sense of liberation or expression that's central to the plot and characters. It might also draw attention to a particular aspect of the narrative or convey a mood or tone.
Well, Vegeta would be a likely character. He might be initially suspicious of the female Goku. Maybe he thinks she's a threat or just can't believe there's another Goku - like being. He could be there to add some comical moments as he tries to understand the situation.
It could be a call to share an old and beloved story through song. Maybe it's about a traditional tale that holds a special place in a community or family.
In general, it's a bit of a toss-up. The strength of Manga Goku and Anime Goku can vary depending on the specific arcs and battles. Sometimes, it might seem like one is stronger in a particular situation, but that could change in another.