I'm creating my own, original song. How do I know if i'm in tune?

I am sending my vocals off to a local recording studio to have my own song recorded. They are sending me a few sample beats and then i have to send back my vocals again "in tune" and "in time" with the beat I choose so they can finish mixing and mastering it. How do I know if i'm in tune... show more I am sending my vocals off to a local recording studio to have my own song recorded. They are sending me a few sample beats and then i have to send back my vocals again "in tune" and "in time" with the beat I choose so they can finish mixing and mastering it. How do I know if i'm in tune with the beat??
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