Open your Account Page, scroll down and click on SIGN OUT EVERYWHERE.
The fastest way to clean a playlist out from unwanted songs is to hold the CTRL key on your keyboard while selecting the songs. Once you're ready with the selection, simply press the Delete button on the keyboard and all the songs you've selected will be deleted.
Alternatively, you can click on a single song, hold the Shift key and then select another song for the end of your selection. All songs included between the first and the last song you selected will be deleted after pressing the Delete key.
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“Music is the strongest form of magic.” Marilyn Manson