What Are the Rules about Using Music in Videos and Podcasts?

Today's question comes from Bryan, who asks about using music in videos and on podcasts. Does he need to buy music or is it sufficient merely to give credit to the artists? Bryan's site is http://thebusinessplan.co/. You can buy music at iStockPhoto.com (http://www.askpat.com/istock-photo) or AudioJungle (https://audiojungle.net/) or use music in the public domain (http://www.pdinfo.com/public-domain-music-list.php). Do you have a question about copyright licenses? Record it at http://www.askpat.com/.See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.