Now that the Facebook is migrating all user profiles to the new style, we will loose the feature of profile tabs. Tabs from now on will only be supported on pages. If you have created a dedicated Facebook page for your musician profile you are fine, if you used your user profile, you are screwed.
In general, I think it is a good step in the right direction. As user profiles should only be used for your friends and proper privacy settings can be applied. At the same time, you can publish lots of data on your dedicated musician profile page - with less strict privacy settings.
With respect to COMUSICO, these changes force us to scrap our current implementation and create something new which is fitting the new system. But we hope to come up with something note worthy.