4. Freddie Mercury
Freddie Mercury brought the vocal power and the drama of opera to Queen. Just listen to "The Show Must Go On" from their 1991 album Innuendo. Freddie knew he didn't have long to live when he cut the song, but he poured all of his heartache and emotion into the track. Twenty years later, it remains gut-wrenching to hear. In his younger years, he could command the attention of 80,000 fans at a soccer stadium with his soaring voice and incredible stage presence. His sense of joy on stage was palpable, and the fact that he died when he was just 45 is one of rock's greatest tragedies.