hasHookSinger

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: hasHookSinger

Indicates that one entity serves as the hook singer (performing the main recurring vocal refrain) for another entity, typically a song or musical track.