Is there a song that changed your life? NPR's music authority Bob Boilen posed that question to some of today's best-loved musical legends and rising stars. In their answers the artists reflect on pivotal moments that inspired their work.

"From the creator of the popular website covermesongs.com comes the perfect book for music fans: the inside stories behind 20 iconic cover songs and the artists who turned them into classics. A great cover only makes a song stronger. Jimi Hendrix's version of Bob Dylan's 'All Along the Watchtower.' The Beatles rocking out with 'Twist and Shout.' Aretha Franklin demanding 'Respect.' Without covers, the world would have lost many unforgettable performances....