You can simply list the books you recommend, offer to lend them, or give them away. The details are entirely up to you. This service helps you find other people and their books.
This system is focused on creating local intellectual ecosystems (and imagine how many more books are around town than at the library. the librarian's own hoard, for example), and allowing for radically experimental and social cataloging. You should ask about that.
As you browse your bookshelf, remember the dusty clarinet or guitar and list them in our new library of musical instruments.