He typically dresses like an undead pirate at his shows, which still sell out by the way. Cooper is a great frontman because of his propensity for theatrics and showmanship, in addition to his intensely piercing voice. He has been called the "campiest" rockstar of all time, but we're assuming he takes that as a compliment.
Eric Clapton
Clapton has been referred to by hundreds of musicians as "arguably the best guitarist who ever lived." Although he may have denied that statement, people didn't spend $200+ on resale tickets in the 1980s to watch a mediocre guitar player.
Clapton fused blues and rock in an accessible and exciting manner. He also incorporated a fair deal of free jazz and metal theory in his solos, but his smooth playstyle made these sounds authentic and accessible. Clapton was the first guitar player to make the complex compatible with the public, and your dad probably talks about him every opportunity he gets.
Willie Nelson
The great Willie Nelson is one of the last true cowboys that made music for the people. Nelson was born in 1933 and he's still performing with the same energy he had when he was a kid. In fact, Willie has been performing for just over 60 years!