Tool needed to fix Justin Bieber

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

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