Denver Public Library has a local music site (you can listen to samples if you don't have a library card from them) as do Madison Public Library, Johnson County Library and others.
Music is important, and it has been harder to collect local content in this area. These libraries have found a solution and it also makes it easy for people to listen to local musicians. This has many excellent local studies possibilities as well as current content.
I found out about these examples because I follow the Library as incubator project blog.