From the late 1960s through to the early 1980s, a piano was generally used in reggae to double the rhythm guitar's skank, playing the chords in a staccato style to add body, and playing occasional extra beats, runs and riffs. The piano part was widely taken over by synthesizers during the 1980s, although synthesizers have been used in a peripheral role since the 1970s to play incidental melodies and countermelodies. Larger bands may include either an additional keyboardist, to cover or replace horn and melody lines, or the main keyboardist filling these roles on two or more keyboards.
The reggae-organ shuffle is unique to reggae. Typically, a Hammond organ-style sound is used to play chords with a choppy feel. This is known as the bubble. There are specific drawbar settings used on a Hammond console to get the correct sound. This may be the most difficult reggae keyboard rhythm. The 8th beats are played with a space-left-right-left-space-left-right-left pattern, where the spaces represent downbeats not played—that is the left-right-left falls on the ee-and-a.
Horn sections are frequently used in reggae, often playing introductions and counter-melodies. Instruments included in a typical reggae horn section include saxophone, trumpet or trombone. In more recent times, real horns are sometimes replaced in reggae by synthesizers or recorded samples. The horn section is often arranged around the first horn, playing a simple melody or counter melody. The first horn is usually accompanied by the second horn playing the same melodic phrase in unision, one octave higher. The third horn usually plays the melody an octave and a fifth higher than the first horn. The horns are generally played fairly softly, usually resulting in a soothing sound. However, sometimes punchier, louder phrases are played for a more up-tempo and aggressive sound.
The vocals in reggae are less of a defining characteristic of the genre than the instrumentation and rhythm, as almost any song can be performed in a reggae style. However, it is very common for reggae to be sung in Jamaican Patois, Jamaican English, and Iyaric dialects. Vocal harmony parts are often used, either throughout the melody (as with bands such as the Mighty Diamonds), or as a counterpoint to the main vocal line (as with the backing group I-Threes). The British reggae band Steel Pulse used particularly complex backing vocals. An unusual aspect of reggae singing is that many singers use tremolo (volume oscillation) rather than vibrato (pitch oscillation). Notable exponents of this technique include Dennis Brown and Horace Andy. The toasting vocal style is unique to reggae, originating when DJs improvised along to dub tracks, and it is generally considered to be a precursor to rap. It differs from rap mainly in that it is generally melodic, while rap is generally more a spoken form without melodic content.