We had an apartment in Cremona for a week in 2008 and loved it. I am a (not very good) violinist, so I had some interest in the history. One museum is in the Palazzo del Comune, which also houses the tourist office on its first floor. It's directly opposite the Duomo and displays a number of instruments. Buy tickets from the bookshop on the right-hand side of the courtyard. Try to visit when one of the Stradivaris will be brought out and played. My (possibly outdated) info says this happens at 11:15 and 12:00 Monday-Saturday and also at 3:30 during the summer. The tourist office will know about this and they also supposedly have a list (according to Lonely Planet) of 100 violin-making workshops that can be visited and can advise on those where English is spoken. A second museum, Museu Civico "Ala Ponzone," 10 or 15 minutes by foot from the first, displays instruments by many of the famous early makers and also shows models, paper patterns, tools and acoustic diagrams from Stradivari's workshop. They show a video about violin-making which runs alternately in Italian and English. While there, we were also lucky enough to catch a wonderful concert at Cremona's lovely theatre (www.teatroponchielli.it). Have fun!