Bass

The bass guitar often plays the dominant role in reggae, and the drum and bass is often the most important part of what is called, in Jamaican music, a riddim (rhythm), a (usually simple) piece of music that's used repeatedly by different artists to write and record songs with. Literally hundreds of reggae singers have released different songs recorded over the same rhythm. The central role of the bass can be particularly heard in dub music — which gives an even bigger role to the drum and bass line, reducing the vocals and other instruments to peripheral roles.
The bass sound in reggae is thick and heavy, and equalized so the upper frequencies are removed and the lower frequencies emphasized. The bass line is often a repeated two or four bar riff when simple chord progressions are used. The simplest example of this might be Robbie Shakespeare's bass line for the Black Uhuru hit "Shine Eye Gal". In the case of more complex harmonic structures, such as John Holt's version of "Stranger In Love", these simpler patterns are altered to follow the chord progression either by directly moving the pattern around or by changing some of the interior notes in the phrase to better support the chords.