 Endtroducing ..... is opened by " Best Foot Forward " , a brief 48 @-@ second collage of various hip hop vocal samples , along with instances of scratching . " Building Steam with a Grain of Salt " is built around a looped piano melody , with various other musical elements entering throughout the song 's duration : interview samples , a women 's choir , bass fills , electronically altered drum kicks , and a funk guitar . " The Number Song " is characterized by its usage of various breakbeats and vocal samples of count @-@ offs . " Changeling " is reminiscent of new @-@ age music and differs from the fast @-@ paced nature of the album 's previous tracks , slowly building up as more samples are mixed in before finally ending with a " sublimely spacey " coda . It segues into the first of three " transmissions " placed throughout the album , each featuring a recurring sample from the film Prince of Darkness ( 1987 ) . " What Does Your Soul Look Like ( Part 4 ) " evokes " uneasy futurism and techno @-@ anxiety " and fuses a " rolling bass groan " with wordless , robotic chants . Track six is an untitled interlude featuring a man reciting a monologue about " Maureen and her five sisters " over a funk sample . 
