What are the first notable instances of equal two-part subdivision?

• A. Little Richard's 'Tutti Frutti' and Chuck Berry's 'Roll Over Beethoven'
• B. Elvis's 'Jailhouse Rock' and Buddy Holly's 'Peggy Sue'
• C. Chuck Berry's 'Brown Eyed Handsome Man' and Fats Domino's 'Blueberry Hill'
• D. Ray Charles's 'I Got a Woman' and 'What'd I Say'

Answer: (A)

Equal two-part subdivision means dividing each beat into two equal parts, producing straight eighth notes rather than a swing or triplet feel. This gives rock and roll its crisp, driving pulse.

These two early rock and roll recordings show that straight, even subdivision clearly and powerfully. Tutti Frutti uses a relentless, steady division of the beat with the rhythm section locking into even pulses, creating a bright, pushy groove that doesn’t funk with swing. Roll Over Beethoven follows with guitar riffs and backing that emphasize the same even subdivision, delivering a tight, propulsive tempo that becomes a hallmark of the new rock sound.

This approach contrasts with earlier blues and R&B styles that often favored a swung, triplet-based vibe. So, these tracks are noted as early, notable examples that helped establish the straight two-part subdivision core of rock rhythm.