premise: To Pimp a Butterfly was a song.
hypothesis: To Pimp a Butterfly is the third studio album by American rapper Kendrick Lamar . It was ranked as the best album of 2015 by many publications , including Rolling Stone , Billboard and Pitchfork . It was nominated for Album of the Year and won Best Rap Album at the 58th Grammy Awards . Its singles `` i '' ( in 2015 ) and `` Alright '' ( in 2016 ) each won a Grammy for Best Rap Song and Best Rap Performance , with the latter also nominated for Song of the Year . The album 's release was supported by five singles -- `` i '' , `` The Blacker the Berry '' , `` King Kunta '' , `` Alright '' and `` These Walls '' featuring Bilal and Anna Wise .