Sony Mobile has begun to roll out new Album and Walkman media apps for the Sony Xperia Z. The latest Album app has version number 5.1.A.0.4, whilst the Walkman app has been updated to version 7.9.A.0.1. Amongst the changes include gapless back in the Walkman app as well as Music Unlimited streaming integration. You can find download links for both apks below.
Album 5.1.A.0.4
Walkman 7.9.A.0.1
Via xda-developers.
Thanks Sami!