I'm considering upping the quality to 128kbps on my shoutcast server.
Update: it didn't really make that much of a difference, so back to 96kbps we go. It seems that perhaps I should have encoded those tracks at something better than 128kpbs -- for the record, this is the first time I've noticed the lossiness of MP3s at 128kpbs, but with higher-pitched piano notes, the loss in quality is glaring (although the original -- non-re-encoded -- tracks are ever-so-slightly better).
Oh, well.