Much-impersonated icon

• The Spanish sextet’s famous singer
• Grammy Lifetime Achievement Award winner of 1971
• Impersonators grow their sideburns to imitate him
• Presley or Costello
• Singer befriended by a young Forrest Gump
• "Watching the Detectives" singer Costello
• "___ has left the building" (phrase at the end of a certain rock show)

Wikipedia Word definitions in Wikipedia
Elvis is a 1979 American biographical television film directed by John Carpenter , and starring Kurt Russell as Elvis Presley , originally aired on ABC . It marks the last role on television for Russell, and the first collaboration between him and Carpenter. ...