Mojo not only allows you to share iTunes library with others, but it will also let you download tracks from other people's libraries.
With an interface reminiscent of both iTunes and a messaging client, Mojo is easy to work with. It will display all libraries, that is if you have found others to connect with, in a list. Clicking on a library will bring up an iTunes like interface from which you can see all your tracks (in grey), protected songs (in red) and your contacts' songs. You can also see other iTunes sections like shows, movies or podcasts and even subscribe to others' playlists. Changes will be automatically downloaded to your library so you are always up to date.
Mojo offers a basic playback function at the bottom left to listen to the tracks and you'll notice you can download tracks via the button on the bottom right. The process is fairly quick with an audio file but can take more time with video. Mojo is very enjoyable to use but unfortunately it can be difficult to find other users also connected to Mojo. Both of you will have to agree on the port to use to share songs.
Despite some difficulties in finding other users to share libraries with, Mojo is an enjoyable program to listen to other iTunes libraries.