Reggae is a music genre first developed in Jamaica in the late 1960s. While sometimes used in a broader sense to refer to most types of Jamaican music, the term reggae more properly denotes a particular music style that originated following on the development of ska and rocksteady. Reggae is based on a rhythmic style characterized by accents on the off-beat, known as the skank. Reggae is normally slower than both ska and rocksteady. Reggae usually accents the second and fourth beat in each bar, with the rhythm guitar also either emphasizing the third beat or holding the chord on the second beat until the fourth is played. It is mainly this "third beat", its speed and the use of complex bass lines that differentiated reggae from rocksteady, although later styles incorporated these innovations separately.

Reggae is either played in 4/4 time or swing time, because the symmetrical rhythmic pattern does not lend itself to other time signatures such as 3/4 time. Harmonically, the music is often very simple, and sometimes a whole song will have no more than one or two chords. These simple repetitive chord structures add to reggae's sometimes hypnotic effects.

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. Reggae is noted for its tradition of social criticism in its lyrics, although many reggae songs discuss lighter, more personal subjects, such as love and socializing. Many early reggae bands covered Motown or Atlantic soul and funk songs. Some reggae lyrics attempt to raise the political consciousness of the audience, such as by criticizing materialism, or by informing the listener about controversial subjects such as Apartheid. Many reggae songs promote the use of cannabis (also known as herb, ganja, or sensimilia), considered a sacrament in the Rastafari movement. There are many artists who utilize religious themes in their music whether it be discussing a specific religious topic, or simply giving praise to God (Jah). Other common socio-political topics in reggae songs include black nationalism, anti-racism, anti-colonialism, anti-capitalism and criticism of political systems and "Babylon"...