Stevie Wonder's various synths and electric pianos are always great tells. You can hear the quality of a rig when he's on. Especially his intros with lots of tremolo. I have hotter than july and songs in the key of life at 24bit. The rest I have at 16bit but want to upgrade when I can afford it. Another really funky 24bit is Slave/Slave from 1976. It's got serious syncopation and timing cues that come out in hi-res, and the bass string and fret noise is something to behold on a nice system.