Note that Play Music icon *does* appear in the launcher.

Have filed a feedback report from the device, including this bug # in feedback text.

I think the issue here is that the Google Play Music app used to be a packaged app, but got deprecated and turned into a hosted app that just points at the website, and we've never shown hosted apps on the chrome://extensions page, only the app launcher and chrome://apps page, because they're more like bookmarks. I agree this is now sort of a weird user experience; hosted apps have been deprecated for a while and normal developers can't upload them to the webstore; they must have used some special internal access to make this change. 

There are actually two versions.

1) The hosted app: https://chrome.google.com/webstore/detail/google-play-music/icppfcnhkcmnfdhfhphakoifcfokfdhg 

As asargent mentioned, this simply launches the play music website and won't show up in the //extensions page because hosted apps don't show up there. If you installed this one, it is expected behavior.

2) The packaged app: https://chrome.google.com/webstore/detail/google-play-music/fahmaaghhglfmonjliepjlchgpgfmobi

This is a special helper application that handles music uploads. It's not published in the Webstore but I think the Play music website promotes it to Chrome users. This one should show up in the //extensions page because it's a packaged app. 

So if you installed the packaged app, I think this is a bug, but my guess is that you installed the hosted app.

Looks like I have the hosted app installed, so I get the "weird user
experience".

+tbuckley

I agree that it's somewhat confusing that Chrome packaged apps are shown in chrome://extensions while hosted apps aren't. In other UI surfaces like chrome://apps, we generalize both of these types of apps as "Chrome Apps".

Given that hosted apps will continue to be supported on Chrome OS, would it make sense to also show hosted apps in the MD extensions page under the "Chrome Apps" section?

What do you guys think?

I believe that is currently the plan (and the implementation?).

wez@, you could try enabling md extensions (chrome://flags/#enable-md-extensions) and see if it shows up in the chrome apps section.  (Note that md extensions isn't ready to ship; there's missing functionality and a lot of ui roughness, but this part should be there.)

I'm looking at md extensions on my Chromebook, and it doesn't look like any of my hosted apps are there.

Perhaps it's just that this hasn't been implemented yet?

Yes, the plan is to have a section for Chrome apps, both v1 and v2: https://docs.google.com/presentation/d/10GH16zrHCoyBGR2n3PEOOoHa9vTxwPHGBiLAuJd0z5Q/edit#slide=id.g1c7af9e1c2_0_79