Did this for fun in less than 10 minutes, using the computer output of my computer and my Grados. Marked all the 320kbps MP3 on the songs I didn’t know. The Vega one I got right at the first try with half the song played, yes I know my Suzanne.
This means that I wasn’t actually hearing the songs, with songs I actually know like the Vega one I can notice mp3 vs lossless because I know the song in it’s full. Anyone who takes this test for more than half an hour and tries a second run just because got something wrong needs to chill a bit. Unless you got some really expensive gear.
I think I might need a DAC one of these days maybe that way I can find more correct ones.
I could lie and say I got all of them or at least half of them correct.
I didn’t lie because I already know I can’t notice high-quality mp3 vs lossless in songs I don’t know. That’s also why I use mp3 in my portable player because I don’t notice the details in the street.