Sonific allows users to select a song from their catalog and add it to any website, blog or social network profile. I have been aware for them for some time but avoided using the service because their catalog was so small and I had a very difficult time finding anything I would want to hear. Thankfully, Sonific has added another 100,000 tracks with an emphasis on Jazz and Blues. They have also announced a new beta service that allows artists and labels to upload their own content for use within the Sonific network.
At least they have some music I like now. However the service still sufferers from a few major problems. Now that the catalog is growing, they need to seriously work on their search and browse functionality. Genres are represented using a tag cloud which doesn’t make much sense as users can’t tag songs. It’s also a waste of space since there are only about 12 genres to choose from. When selecting a genre from their tag cloud, you get a list of subgenres and featured artists. However, many times a subgenre will return no results. Suggestion: Hide subgenres if you don’t have any content in them. They could also use a genre-specific page that contains charts of top songs, top artists, etc. 
There’s no way to currently just see a list of artists in a genre without scrolling through a very large set of song-based search results. Suggestion: provide a way to quickly browse artists outside the context of a song. iTunes’ 4-pane browse feature does this well and LaLa has extended it to their new service. And last but not least, the fact that I need to click the “Find Songspots” tab every time i want to find something is needlessly annoying. Suggestion: provide a persistent search box on every page.
Setting up a Songspot for your site is pretty straightforward and they support over 42 platforms. Just select the “Use” button on any item you want and configure the widget for your site. My only suggestion here would be for a live preview of the player that dynamically updates as you change your settings. Sonific keeps a record of your songspots and you can always go back and edit ones you have created. 
My major issue with Sonific is that other services out there (legal issues aside) like imeem, ProjectPlaylist, Finetune and Dizzler allow you to create and share entire playlists of music where Sonfic restricts you to a single song. This may be cool for a “Song of the Day” feature or featuring a specific podcast. However, in the end I don’t know if this model can compete with the ability to share multiple songs via a single widget.