"She's the One" is a rock composition written by Bruce Springsteen for the Born to Run album, recorded in June 1975 at 914 Sound Studios and released on Columbia Records in August of that year. The song is built around a driving Bo Diddley beat that drummer Max Weinberg shaped during the recording sessions, transforming an earlier arrangement that had more of a Band-influenced feel into a staccato-rhythm rocker rooted in 1950s rock and roll. Springsteen has acknowledged that the song originated primarily as a vehicle for E Street Band saxophonist Clarence Clemons, with the beat constructed first and lyrics added afterward. Some lyrical material was drawn from the 1973 outtake "Santa Ana," and early drafts involved swapping lines with "Backstreets." The composition explores themes of romantic obsession and emotional turmoil, with the melody and arrangement building through verses and choruses toward Clemons's prominent tenor saxophone solo. The track was mixed in mono, an unusual choice for a mid-1970s rock recording, lending it a raw, period-appropriate quality that reinforces its debt to early rock and roll. "She's the One" was also issued as the B-side to the "Tenth Avenue Freeze-Out" single. In concert, the song became one of Springsteen's most frequently performed pieces, played over 565 times across his career, often preceded by or transitioned from Bo Diddley covers like "Mona," making it a reliable vehicle for the E Street Band's live energy.