The band ZZ Top is marking 50 years together, with a new remastered collection of their greatest hits, "Goin' 50." Jim Axlerod talks with guitarist Billy Gibbons, bassist Dusty Hill, and drummer Frank Beard (the one without a beard) who are still working hard to make their pedal-to-the-metal, bluesy country rock seem so easy.Subscribe to the "CBS Sunday Morning" Channel HERE: http://bit.ly/20gXwJTGet more of "CBS Sunday Morning" HERE: http://cbsn.ws/1PlMmAzFollow "CBS Sunday Morning" on Instagram HERE: http://bit.ly/23XunIhLike "CBS Sunday Morning" on Facebook HERE: http://on.fb.me/1UUe0pYFollow "CBS Sunday Morning" on Twitter HERE: http://bit.ly/1RquoQbFollow "CBS Sunday Morning" on Google+ HERE: http://bit.ly/1O3jk4xGet the latest news and best in original reporting from CBS News delivered to your inbox. Subscribe to newsletters HERE: http://cbsn.ws/1RqHw7TGet your news on the go! Download CBS News mobile apps HERE: http://cbsn.ws/1Xb1WC8Get new episodes of shows you love across devices the next day, stream local news live, and watch full seasons of CBS fan favorites anytime, anywhere with CBS All Access. Try it free! http://bit.ly/1OQA29B---"CBS Sunday Morning" features stories on the arts, music, nature, entertainment, sports, history, science, Americana and highlights unique human accomplishments and achievements. Check local listings for CBS Sunday Morning broadcast times.