Luther Vandross, "Power of Love/Love Power" (1991)

His biggest hit, but not his signature song

Peak: #4 on the Hot 100
Streams: 7 million

Signature songs are funny things. Sometimes, artists become synonymous with their biggest chart hits, like Whitney Houston and “I Will Always Love You” or the Bee Gees and “Stayin’ Alive,” but sometimes a song that performed modestly during its original run goes on to define an act in the public imagination.

Take…