I did promise I'd write some code...

[waider]

I've more-or-less completely overhauled the half-assed API I slapped together for the first run at the Sony Network Walkman tools. The new API is a lot saner and does pretty much all of the things you'd need to do. There's still scope for a few extra utility functions in order that you don't end up messing about in the data structure internals, and I'd like to abstract away some of the string format conversion, but these things will, I'm sure, eventually come to pass. Unless I get distracted by ... oh! bright shiny object! (Sony bits here)