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WHY DO VIOLINISTS ALWAYS LEARN PIANO?
Well that makes me an odd one out then. Here's a professional violinist who's piano skills are virtually non-existant!! - and many violinists I work with are also non-pianists too.
I know where all the notes are!!, can bash out a grade 1 piece after sufficient practice and play a few scales, but that's as far as it goes. All self-taught. However, a lack of keyboard skills didn't stop going to music college or lessen my chances of being a professional musician.
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Basically, if you're going to do anything serious with music at all, piano is essential
Not entirely true, unless you teach singing, school music or really need to be able to play the piano to earn a living from whatever musical career you have.
I'm sure it must be great to be able to sit down at a piano with sufficient skill to play anything up to around grade 6, but I also think it's important to consider what sort of career (or pleasure) you want from music before deciding if a certain level of keyboard facility is essential.
Music colleges seem to insist these days that non-pianist students are around Grade 5 standard at the keyboard, mainly because they want you to do things like harmonisation at sight and general musicianship skills, not because they think you should play the piano as well. Sure it's a useful ability, but certainly not a 'must have'.