I have been told by some violinists that you should change all strings at one time. I break E strings every few months (aggressive blues and jazz) so I was wondering if it was better to replace the other strings at the same time I put a new E string onto the violin.
My teacher says it is not necessary to change all the strings. E strings often break more than others b/c they are usually steel. When I buy a set of strings, I always buy an extra E too. Depending on how much you play, you may not need to change the strings very often. You can probably tell when they sound kind of dead.
Changing strings is not necessary all at the same time. I would recommend sticking to the brand of strings you have on your instrument, as that can not sound as good when they are different. But as long as you stick to the same brand, you can’t go wrong changing one at a time. It would also be very expensive to change them all at once as good quality strings cost at least $50. Good question!