The Guitar Channel produces an audio podcast regularly with interviews with musicians and pros from the guitar world (luthier, builder, etc.).
List of the audio shows available in the podcast: theguitarchannel.biz/tag/podcast/
RSS link: theguitarchannel.biz/feed/podcast/
All the smartphone major systems offer a standard podcast app. On iOS the standard Podcast app from Apple is an excellent podcatcher app.
In all the articles with a podcast you will find a section similar to the one on the image below. By clicking on the embedded player you will be able to listen to the audio show straight from the web page.