Music Industry Apps

Spotify is a commercial music streaming service that provides digital rights mangment restricted content from record labels. Music can be browsed or searched by artist, album, genre, playlist, or record label. Paid "Premium" subscriptions remove advertisements and allow users to download music to listen to offline.
Spotify was launched in October 2008 by Swedish startup Spotify AB; as of 15 September 2010, the service had approximately 10 million users, including 2.5 million users with paid subscriptions.The service reached 20 million users (5 million paid) by December 2012,and 60 million users (15 million paid) in January 2015.
Source: Wikipedia

Tidal App according to iTunes description is the world's first music service with high fidelity sound quality. Created by artist Jay-z this recent 2015 app is signing a various of different artist. The app is similar to the popular app Spotifier. 
Source: iTunes