"Stronger" was produced by West with an extended outro handled by Mike Dean. It was written by West and Daft Punk were credited as co-writers due to their work being sampled, while Edwin Birdsong also received a credit from a master use of "Cola Bottle Baby". West decided to sample "Harder, Better, Faster, Stronger" after first hearing the duo's work when touring in 2006, then made the beat and spent months re-writing his verses. The song's production process was arduous, with various engineers and 75 different mixes, even having the drum programming redone with Timbaland after its release. Daft Punk voiced their approval of the song, finding West made the sample suitable for his personality as he ventured outside of hip hop. After West shared a snippet in May, "Stronger" was released to US rhythmic contemporary radio stations as the second single from the album on June 26, 2007, through Roc-A-Fella Records and Def Jam Recordings. A maximalist hip hop song also based in electronica with varied elements of electronic music, it relies on a slowed vocal sample of Daft Punk's "Harder, Better, Faster, Stronger". Described by West as an emancipation from his previous mistakes, the song's lyrics are themed around self-empowerment. He finds his patience strengthens him when he has lust for a girl on the chorus, paraphrasing Friedrich Nietzsche's dictum: "What does not kill him, makes him stronger." The song received generally positive reviews from music critics, who mostly highlighted the sample of "Harder, Better, Faster, Stronger". Focus was often placed on West's innovation through the sample and combination of genres, while critical assessments of his rapping were somewhat mixed. - Wikipedia