Some songs, chants, and enhancements available to Bards grant Music bonus.
Multiple sources of Music bonus do not stack, only the highest bonus applies. For example, the Warchanter capstone song enhancement does not stack with several chants available as lower level enhancements.
This stub is related to Dungeons and Dragons Online and needs to be filled out. If you are considering filling it out, some good places to check would be both the google and ddo.com forum search pages. You can help expand it by clicking at the top of the page.