In music and dance
- A note played for one-eighth the duration of a whole note is called an eighth note, or quaver.
- An octave, the interval between two notes with the same letter name (where one has double the frequency of the other), is so called because there are eight notes between the two on a standard major or minor diatonic scale, including the notes themselves and without chromatic deviation. The ecclesiastical modes are ascending diatonic musical scales of eight notes or tones comprising an octave.
- There are eight notes in the octatonic scale.
- There are eight musicians in a double quartet or an octet. Both terms may also refer to a musical composition for eight voices or instruments.
- Caledonians is a square dance for eight, resembling the quadrille.
- Albums with the number eight in their title include 8 by the Swedish band Arvingarna and The Meaning of 8 by Minnesota indie rock band Cloud Cult
- Dream Theater’s eighth album Octavarium contains many different references to the number 8, including the number of songs and various aspects of the music and cover artwork
- “Eight maids a-milking” is the gift on the eighth day of Christmas in the carol “The Twelve Days of Christmas”
- The 8-track cartridge is a musical recording format
- “#8” is the stagename of Slipknot vocalist Corey Taylor
- “Too Many Eights” is a song by Athens, Georgia’s Supercluster.
- Eight Seconds, a Canadian musical group popular in the 1980s with their most notable song “Kiss You (When It’s Dangerous)”
- “Eight Days a Week” is a #1 single for the music group The Beatles.