When you decided to trade in a new Nokia phone because it does not play lossless formats! (The specs said it does!)
I also tried telling the difference between 320k and Lossless. 9/10 for Rock 7/9 for classical 7/10 for Jpop 5/10 for Jazz. My original hypothesis was that some genres are much more easier to tell than other genres.
For me, I could easily tell between rock pieces by listening to the impact of the drums and the bass guitar details, but I can't tell any difference between jazz pieces. Gonna make my friend try this and see his results.