Starting with watchOS 6, developers are able to distribute apps built specifically for the Apple Watch, without a companion app on iOS. These apps can be downloaded from the new App Store app on watchOS 6.
Acquired by SiriusXM in 2018, Pandora is a streaming music service in the United States that features free, ad-supported radio. The service also offers two paid tiers, including Pandora Plus with personalized, ad-free radio for $4.99 per month and Pandora Premium with on-demand music and podcasts for $12.99 per month.
(Thanks, Stefan Constantine!)