Nice idea (BTW: how does it cut text into sequences of words) abut the search is crappy (I tried a few times, no results). Maybe a single search (for both author and title) with references as you type? It would be really, really helpful.
To generate the final graph, I started by more or less splitting the entire song into a list of words, then iteratively rejoining fragments in an order based on frequency of occurrence.
So, something Google-like rather than SQL-query-like.