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a question about plot a list of functions.

I defined a function as
K=(2 r/(1-r^2))^2;
y=1/(1+K (Sin[x])^2);
Now the result is a list.
I want to plot y vs. x in one figure and I did the following
Plot[y, {x, 0, 10 Pi}];
But Mathematica gave me an error.
I changed it to
Plot[{y[[1]], y[[2]], y[[3]]}, {x, 0, 10 Pi}];
Mathematica gave me a correct plot. Can anyone give me some idea why the error message is given by Mathematica since y is a list and nothing is diffrent from {y[[1]], y[[2]], y[[3]]}? 

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