Based in Houston, The Moving Sidewalks were a psychedelic garage quartet that existed during the second half of the 1960s. The group famously featured singer-guitarist Billy Gibbons and drummer Dan Mitchell prior to their forming ZZ Top. Inspired both musically and conceptually by Roky Erickson and the 13th Floor Elevators, The Moving Sidewalks' sole full-length album Flash was released in 1969 by Tantara Records. Other members who appeared on the album were bassist Don Summers, keyboardist Tom Moore, and multi-instrumentalist Isaac Costa. In 2013, Gibbons announced the reformation of the original lineup of the band, and they performed headlining shows in Austin, Houston, and New York City. Liberation Hall's reissue includes the non-LP bonus single "99th Floor."