The Rosanna shuffle is the drum pattern from the 1982 Toto song "Rosanna", played by Jeff Porcaro.
It is known as a "half-time shuffle" and shows "definite jazz influence".Strong, Jeff (2006). Drums for Dummies, p.183. ISBN 0471794112. Porcaro created the rhythm by combining various influences including the Purdie shuffle, the drum pattern played by John Bonham in the song "Fool in the Rain" and the Bo Diddley beat, along with many ghost notes.
Sources
External links "Jeff Porcaro", Drummer World. including the actual beat with transcription. "Toto IV Lyrics", Official Toto website. "Rosanna by Toto", SongFacts.com. "Rosanna by Toto" from Music.Yahoo.com.