Improve one's pitch, in a way

• Tool needed to fix Justin Bieber
• Get perfectly pitched, in a way
• Musical tool on Time's list of "50 Worst Inventions"
• The "A" in Jay-Z's "D.O.A."
• Pitch-correcting audio processor
• It can stop you from being pitchy
• Oft-abused computer plug-in used in modern music
• Make a remix for YouTube, often

Wiktionary Word definitions in Wiktionary
vb. (alternative form of auto-tune English)