The musicians in whom we have great interest toured Europe w

很荣幸为您解答.
　　句子分析.
　　主干是The musicians toured Europe.
　　in whom we have great interest是定语从句,修饰The musicians.即 whom we have great interest in
　　with us是补充说明toured Europe.
　　我们非常感兴趣的音乐家们和我们一起畅游欧洲.
　　如有不懂欢迎继续追问,随时为您解答.