Jazz Ensemble Jazz Ensemble - Level 4 - Digital Download SKU: A0.1290232 By Bobby Day. By Leon Rene. Arranged by Zoran Radanovic. 20th Century,Contemporary,Multicultural,Standards,World. Score and Parts. 49 pages. Zoran Radanovic #880938. Published by Zoran Radanovic (A0.1290232). This arrangement is for jazz ensemble. Set of parts.Rockin' Robin (originally released as Rock-In Robin on the Class Records 45 single) is a song written by Leon René under the pseudonym Jimmie Thomas, and recorded by Bobby Day in 1958. It was Day's biggest hit single, becoming a number two hit on the Billboard Hot 100, and spent one week at the top of the R&B sales chart.[3] Michael Jackson recorded his own version of the song in 1972, which also achieved success.