Cross Price Elasticity of Demand - Music Streaming Hits Album Sales

Thanks to tutor2u for this
http://www.tutor2u.net/economics/blog/cross-price-elasticity-of-demand-music-streaming-hit-album-sales?utm_medium=email&utm_campaign=Economics%20daily%20digest%20Thu%2014th%20January%202016&utm_content=Economics%20daily%20digest%20Thu%2014th%20January%202016+CID_1321dad8d69efa003b176e7d38acd312&utm_source=CampMonitor&utm_term=Cross%20Price%20Elasticity%20of%20Demand%20-%20Music%20Streaming%20Hits%20Album%20Sales%20The%20growing%20popularity%20of%20relatively%20low-priced%20music%20streaming%20from%20services%20such%20as%20Apple%20Music%20and%20Spotify%20is%20coming%20at%20the%20expense%20of%20other%20market%20segments%20This%20is%20a%20good%20example