Introducing the Google Play artist hub
plus.google.com
plus.google.com
Then there is this problem when you want some music and you have to figure out who carries it first.
There's also normally a bunch of indie aggregators. In New Zealand we have dunedinmusic.com and amplifer.co.nz to name but two.
Most of these exist because apple and amazon won't let just anyone set up and sell on their stores.
Music artists need all kinds of support: Marketing help, design help, someone technical to upload and produce their stuff. If they can provide some of that support then maybe this will have a better chance.
And there are a lot of countries where neither iTunes or Google Play are available, and maybe aren't going to in observable future.
Just because Apple already did it doesn't mean there isn't room for something else.
Exactly what Google is up to.