Twist and Shout

The song's harmony is defined by its relentless I-IV-V7 cycle in D major, a hallmark of 1950s R&B and early 60s beat music. Its primary harmonic distinction lies not in chord variety, but in the use of the V7 chord as a tension-building device during the vocal 'climb,' where the addition of the flat 7th (G natural) in the vocals over the A major chord creates the iconic bluesy dominant tension that characterizes the Beatles' high-energy cover.

Written by Phil Medley and Bert Berns (credited as Bert Russell), the song was first recorded by the Topnotes in 1961. Producer Bert Berns was dissatisfied with Phil Spector's polished production of the Topnotes version, feeling it lacked the song's inherent energy. Berns later produced the Isley Brothers' version in 1962 to demonstrate how the song should be performed with a raw, gritty R&B feel, which became the blueprint for The Beatles' cover.

Recorded in just one take at the end of a legendary 10-hour marathon session, this cover transformed an R&B hit into a definitive British Invasion anthem. It captures the raw, unbridled energy of The Beatles' early era and remains one of the most iconic vocal performances in music history.