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"Only One" sounds like a bittersweet bonus track from Kanye's 808s and Heartbreak. "Remember how I'd say one day/You'll be the man you always knew you would be," West's Auto-Tuned voice sings. "And if you knew how proud I was/You'd never shed a tear/Have a fear/No you wouldn't do that." McCartney, for his part, eschew any histrionics in favor of a simple and plaintive style befitting the emotional lyrics. "My mom was singing to me, and through me to my daughter," West said in a statement, also noting that the name "Kanye" means "Only one."