system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do dancers count '5, 6, 7, 8', instead of '1, 2, 3, 4' as in music?
gpt
Dancers often use 8 count bars/measures of music, meaning their moves are broken down in 8 counts or 1, 2, 3, 4, 5, 6, 7, and 8.  They will count 5, 6, 7, 8 out loud as a countdown to begin together on 1.  You wouldn't count 1, 2, 3, 4 because you don't want to start on 5.