1. I suspect Auto-tune is the reason I can't understand the lyrics of pop tunes. I think the singer sings the words naturally, then Auto-tune distorts them to tune them.

2. I was in Office Depot, and I made a comment to the clerk about the particularly ugly vocal that was being played. As Matt Milton commented upthread, there was a glissando quality to it. The clerk said, "That's Christina Aguilera. I don't like her either."

Whether her awful singing was a the result of AutoTune or not, I can't say, but I don't have much respect for her judgment in the matter either way.