Without an empirical study, it is hard to say. With the advent of the internet for performance and distribution, enforcement has become very difficulty for any music copyrights generally. What is "weak"? Lengthy duration for music is meaningless --few pieces have much of a lifespan. Protection against literal copying and requirement of paying royalties for performance is what you basically get in every country. The problem everywhere is enforcing those rights and administering a compulsory licensing scheme for performance. Musicians in the United States mostly scratch out a living from live performances. The revenue stream from selling music or recordings is mostly dried up.
I agree. Live performances for the artist earn more than anything else in the U.S. The transaction costs involved in regulating and monitoring in the institutional framework as adopted by U.S are huge. It is seen that copying of some part of the music is permissible under the copyright contracts. This hits the music industry hard even though there are some countries that follow strict rules in this industry. In India it is very easy to download or upload songs. So copyright laws does not seem to play much of a role. Hence affecting the music industry in India
You may want to contrast with the position in Bangladesh, where I'm told by a lawyer friend of mine, whose father is a musician, that there is effectively no real copyright law.