As you may know, Music App is a third party music-player application for Ubuntu Touch, developed by the Ubuntu community members. The developers have redesigned the Music App for MWC, adding Spotify streaming support as well.
This is David Planella’s (Ubuntu Community Team Manager at Canonical) announcement:
“Music app developers Andrew & Victor worked with Michał Karnicki and Michael Sheldon to deliver a prototype build of their app for MWC, demonstrating (Spotify) streaming as a new feature. In tandem they worked on a converged build of Music to demo on tablets at MWC,” ,
As a reminder, Canonical took part at MWC 2016, where it displayed a lot of awesome stuff and won the “Best of MWC” award for the BQ Aquaris M10 Ubuntu Edition tablet.