"E-Pro" is the opening track on Beck's 2005 album Guero. It was released as the lead single from the album in March 2005. The song was Beck's second number 1 on the Modern Rock chart and his first in eleven years. Beck used the rhythm track of the Beastie Boys' "So What'cha Want" as a sample in "E-Pro". Both of those songs are featured in the video game Rock Band 2.

Beck David Hansen, known mononymously as Beck, is an American musician, singer, songwriter, and record producer. He rose to fame in the early 1990s with his experimental and lo-fi style, and became known for creating musical collages of wide-ranging genres. He has musically encompassed folk, funk, soul, hip hop, electronic, alternative rock, country, and psychedelia. He has released 14 studio albums, as well as several non-album singles and a book of sheet music.