I've only been to Paris in months from April to October, but there've been concerts. It's quite possible that they just don't list them until tickets are for sale, and they only go on sale a couple of months in advance. Wait a while and see if there are concerts in November. If there are, chances are pretty good they are year-round. For something really special, I'd look at the opera season. I went to one at the Opera Bastille which is fine if you want to see a performance in a modern venue, but for an 'experience" go to the Opera Garnier. There are also recitals, concerts and ballets performed there.