Sidney Simien (April 9, 1938 – February 25, 1998), known as Rockin’ Sidney and Count Rockin’ Sidney, was an American R&B, zydeco, and soul musician who began recording in the late 1950s and continued performing until his death.

Rockin’ Sidney was a long-time zydeco musician who played almost every style of music, from Caribbean beats to blues. His credits included “No Good Woman”, “You Ain’t Nothing But Fine”, “Tell Me”, and his biggest hit, “My Toot Toot“, which became a worldwide hit.

Simien was born into a long historical Creole French speaking family and a descendant of Antoine of Marseille, France and Marie Simien (who was a free woman of color and a plantation owner). Sidney himself was born in the tiny farming community of Lebeau, St. Landry Parish, Louisiana, United States. Sidney took up the guitar at an early age. He started his musical career at age 14 or 15 playing harmonica and guitar. His first gig was as backup for his uncle Frank Simien. By Sidney’s late teens, he was leading his own band as Sidney Simien and His All Stars, which included several members of his family. In 1957, at the age of 18, he recorded his first side, “Make Me Understand,” on the short-lived Carl label. “No Good Woman” became a small hit in Louisiana in 1962, while the flip side, “You Ain’t Nothing But Fine” brought him his first national attention as a songwriter. The Fabulous Thunderbirds recorded the song on their debut album. After that, Sidney recorded “She’s My Morning Coffee” / “Calling You” on the Jin label.