This sound recording is free to use and reuse with proper attribution to the copyright owner, Joe Smith. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission, as long as you clearly give proper attribution.
Also see this detailed guide covering the copyright and ethical considerations of digital sampling of audio and video materials.
Why is this free to use?
Joe Smith, the copyright holder of this collection, donated the recordings to the Library of Congress and agreed to make the material free to use and reuse with proper attribution. Citizen DJ excluded interviews that contained performances of songs that were still in copyright.