The streaming limits for movies and music are described below.
Movies
As a YouTube Premium member, you can enjoy the selection of movies from YouTube Movies & Shows without ad interruptions. For such movies, you are only able to stream on up to two devices at a time per YouTube Premium account and up to four devices at a time per YouTube Premium family plan.
Note: The streaming limit also applies to browsers on the same device. Different browsers on the same hardware/OS (e.g. Firefox and Chrome) will count as separate devices.
Music
As a YouTube Premium member, you can only stream music-related videos on one device at a time. This limitation can apply to any video on YouTube that's categorized as music. If you begin streaming a second music-related video from another device, you'll see an error on the first device: "Playback paused because your account is being used in another location." The second video will continue playing.
We recommend having separate individual Google Accounts to avoid this issue. If several members of your family would like to join YouTube Premium, you can sign up for a YouTube Premium family plan. All family members included in your family plan will get access to YouTube Premium.
Note: The streaming limit also applies to browsers on the same device. Different browsers on same hardware/OS (for example, Firefox and Chrome) will count as separate devices.