Playlists.
A couple more years have gone by and I still can't find any way of uploading playlists in .pls or .m3u format (created in winamp). Neither can I see any way to download a playlist from desktop web to a computer. Weirdly, I can download a playlist I've created to an Android.
Grrr.
1) Save winamp playlist in my /library folder
2) Open WMP and tell it to scan music in /library wait for WMP to finish scanning all the tracks.
3) Confirm the playlist is in WMP and appears to contain all the same tracks and will play
4) Run Music Manager. Tell it to use Windows Media manager. Tell it to upload from a playlist. Choose the playlist.
5) Wait for the upload to complete.
6) Open Google Play Music in desktop Chrome browser. All the tracks are in the GPM library. However the playlist hasn't appeared in "My Playlists".
7) Check in Android GPM. The tracks are there, but not the playlist.
This didn't work 2 years ago, and apparently it still doesn't.
I'll just about accept WMP, but I WILL NOT USE iTunes.
That test required an update of itunes which then demanded a reboot which I ignored. But that's Apple's madness not Google's!