Use any, but do use one...
Why am I saying this? You can start with some randomly tuned instrument and tune all other other instruments to that so all in all the tune sounds ok, but as a whole it is off tone --> Bad.
Also pitch bending because of speed changes when mixing can cause tunes to go off tone.
I almost always write in B or C, I love a B note somehow.
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There's no such thing as a vinyl key.
Back in the days of Mozart & Bach when there wasn't any vinyl they wrote music in a key as well. Just checkout this Wikipedia article on the subject....
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