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It depends if it's a single or a double bar line.
if it's a double bar line it's just there to separate the sections of the music and if it's a single bar line all it does it separate the beats in order to make a measure.
Answer:
Go" is an irregular verb in English and has wide range of uses, usually when you're moving from place to place. It is the only verb that has a suppletive past tense. The past tense of of "go" in English is went. I hope this helped you out!
It most likely means they are singing higher than required
