Recent example: it would be good to be able to select "All Around The World" according to whether it was by Paul Simon or A.T.C. There's quite a few examples of that kind of thing in my collection. "One More Time" by Memphis Slim or Daft Punk is another that I can remember encountering.

As a side note, I'm gradually approaching the stage where I can ask people what sort of music they like, and then have at least a few tracks available. It's pretty cool.

Richard.