firstDateAtNo1Singles

Given a predicate that represents a relationship or action between entities, generate a one-sentence description explaining its meaning.  
# Instructions
Focus on describing the relationship, not the entities themselves. 
# Response Format
Begin the description with \' Indicates...\'

Predicate: firstDateAtNo1Singles

Indicates the date on which an entity (such as an artist, song, or album) first reached the number one position on a singles chart.