Sample: Iron Butterfly "In-A-Gadda-Da-Vida" (1968)
Album: Street's Disciple / Hip-Hop Is Dead
Producer: Salaam Remi / Will.I.Am.
Label: Columbia/Def Jam

It's generally believed that Nas sampled Iron Butterfly's "In-A-Gadda-Da-Vida" twice, on back to back albums, but that's actually not true. For Streets Disciple's "Thief's Theme," producer Salaam Remi hooked up a loop of the Incredible Bongo Band's cover version of Iron Butterfly's 1968 psych rock classic. It was on the title track to 2006's Hip-Hop is Dead that Nas and producer Will.I.Am—yes, that's who produced it—sampled the riffage from Iron Butterfly's original. Appropriately enough, the second most prominent sample in that song is the Incredible Bongo Band's own signature tune, the oft-sampled B-boy classic, "Apache."