apple watch series 5 stream music without iphone

Yes, as long as you have an Internet connection, you can stream music to an Apple Watch without having your iPhone nearby. If you have the cellular version, you'll be able to stream from either an available WiFi or cellular service. If you have the non-cellular version, you can only stream without the iPhone if you have a WiFi connection. With the non-cellular version, you'll need to take your iPhone with you to stream when there is no available WiFi.

At the moment Apple Music is the only service that streams to the Apple Watch.

Pandora paid subscriptions allow for downloading off-line playlists to the Apple Watch.

You can download your own music and podcasts to the Apple Watch

If you have the cellular version of the watch and have an active cellular plan.