It would appear that once again the music industry is at point of disruption - whether it's Imogen Heap's Mycelia project or the one mentioned in this article, something is coming!!
Also, what you actually got was authorisation to download the file (the song file certainly isn't on that blockchain). This has issues in that DRM still doesn't work.
All of this is the record industry panicking at no longer controlling the means of production. However, the big problem with "selling" music is that the marginal cost of music distribution still approaches zero. Blockchains won't solve this.