Sometimes the producer loses the original files. For example, Ariel mixed Roman Reloaded by Nicki Minaj and Eminem to a 2 track because Swizz Beatz couldn't locate the multitracks!
Alternatively, an up and coming artist may only have access to the 2 track, which is what they'll give to you.
This is one of the most helpful and significant things you can do with a 2 track to make it much easier to mix to.
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