www.fnac.com is the website for the music store- it has a “translate” button so you can get it in English. It’s a great resource before ANY trip to Paris to find out what music will be there, but also what art exhibitions and other events are happening. You can buy tickets through it as well for any of the events and also tickets for any of the museums, etc.
www.olympiahall.com is the site for the shows at the Olympia and
www.alhambra-paris.com is the site for the Alhambra.