A riff is a short piece of speech or writing that develops a particular theme or idea. Rowe does a very clever riff on the nature of prejudice. a repeated series of notes in popular or jazz music (Probably from REFRAIN)
A short musical phrase in jazz or blues It may be repeated often during a piece, with changes to the key, rhythm or melody, such as in Glenn Miller's swing hit In the Mood
A group of notes played on the guitar, which may be repeated regularly and can often define a song For example the first thing you hear Ritchie Blackmore playing in Deep Purples Smoke on the water is generally recognised as the best known riff there is
A short repeated melodic phrase or 'signature' that is constructed to attract attention by rhythmic and melodic means Most riffs last for two bars but can vary from one to four bars in length A 'classic' riff can be heard on the introduction to '(I can't get no) Satisfaction' by the Rolling Stones