Music Trivia: Which of these bands has had the same lineup of musicians for over forty years?

Bands break-up and change lineups with the same speed that most of us change underwear - its such a common thing that its almost impossible to keep track of.  However, that being said, the rare band has been able to stay together without any changes - in some cases, for decades.  So, off of Pocket Trivia: Music Trivia - Which of these bands has had the same lineup of musicians for over forty years?  Was it Dire Straits, ZZ Top, The Rolling Stones or Aerosmith?

Not Dire Straits - the band went through nine members in its 18 years, changing its lineup multiple times and shifting its overall size repeatedly to between 4-6 members.

Not Aerosmith.  The band, which has been around since 1971, has gone through three rhythm guitarists and two lead guitars.

It isn't the Rolling Stones either - the band has done through ten total members, including different guitars, drums, bassists and even a keyboardist (very briefly).

The correct answer is ZZ Top.  ZZ Top has been playing since 1969, and for over forty years has had the same three beareded members: Billy Gibbons, Dusty Hill and Frank Beard.