Time signature and key are used to keep order. Ask any performer of notated
music. It makes it easier for them. They hate playing pieces with 7
accidentals in them, and a fucked up beat. You could, in theory, give a
piece the completely wrong key and just correct it with accidentals... and
make a completely insane and difficult to understand rhythm... and it would
still be right. but to make it easy for the performer (and the composer), it
is simplified into an easier to understand key and time signature. it's like
math. that's why equations are simplified. why fractions are usually
reduced down. it's easier to work with.
sorry if this is slightly incoherent, but it's late, and i'm drunk.
jared
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