Last week, in the first live edition of the current Voice cycle, the Top 20 was cut, quickly and sometimes ruthlessly, to a more manageable Top 12. Among the survivors was the performer of the night: former child singer Billy Gilman, whose rendition of “Crying,” made famous by Roy Orbison, was, unthinkably, as chillingly emotional as the original. Tonight, Gilman and 11 others perform – and learn of their fates, after the national vote, tomorrow night.