This paper reports on a prototype providing a 
simple yet efficient interface to navigate through networks of 
music artists. Built upon data gathered from Last.fm, it 
provides two simultaneous layers of information: (i) a graph 
built from artist similarity data, and (ii) overlaid labels 
containing user-defined tags. Differing from existing artist 
network visualization tools, the proposed prototype 
emphasizes commonalities as well as main differences 
between artist categorizations, hence providing richer 
browsing to the user. The prototype can be accessed at 
http://pattie.fe.up.pt/rama