Videos that have your music in them can only get these links if:
We deliver this information to YouTube along with which videos have your music in them. YouTube, through its own relationships with these stores, gets information from iTunes, Google Play and AmazonMP3 that allows it to create a link to buy your music in their stores. This link appears on YouTube below the videos.
NOTE: it can take as long as four weeks for these links to appear. In addition, they do not appear 100% of the time. The best way to make sure the buy links appear is to already have your music live in the stores and enter the ISRC or Song Identifier when you deliver your music to Audiam.