Google Play Music support

[judge2020]

Please follow the guide below

• You will be asked some questions and requested to provide some information, please read them carefully and answer honestly
• Put an x into all the boxes [ ] relevant to your issue (like this: [x])
• Use the Preview tab to see what your issue will actually look like

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.10.20. If it's not, read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2017.10.20

Before submitting an issue make sure you have:

• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

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If the purpose of this issue is a site support request please provide all kinds of example URLs support for which should be included (replace following example URLs by yours):

This is based on the right click -> share -> copy link functionality of items in google play music.

• Single video: https://play.google.com/music/m/Tg5o46ybbyflzb3epfxzr22za64?t=Asian_Jake_Paul_feat_Boyinaband_-_Idubbbz
• Single video: https://play.google.com/music/m/Tli62dsrjbu4b3paiux5uzp5rxq?t=Thats_What_I_Like_-_Bruno_Mars
• Playlist: https://play.google.com/music/playlist/AMaBXykOn9WLvry7WvNVB-721RkJthw2YC4qCLUngsHdXNoOc4W52UzzTH6EEgZipurK_2GXTDWMN6GOvZAs_VKvlfL4vvYNCQ%3D%3D
• Album: https://play.google.com/music/m/Bkgg5do3ni6nyae3hvn6ngtia2e?t=Astro_Lounge_-_Smash_Mouth

Note that youtube-dl does not support sites dedicated to copyright infringement. In order for site support request to be accepted all provided example, URLs should not violate any copyrights.

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Description of your issue suggested solution and other information

Site support for Google Play Music. Hopefully, audio-only services are welcome here. This does require a youtube red/GPM subscription to support non-user uploaded songs.