Similar to tvOS 9.1 Beta 1, the second build of tvOS 9.1 Beta is also a minor update featuring bug fixes, under-the-hood enhancements, as well as performance improvements. Although, tvOS 9.1 Beta 1 did bring Apple Music integration with Siri, enabling users to perform voice action such as searching for and playing their favorite artists, albums, and songs.
tvOS 9.1 Beta 2 is now available through Software Update for registered developers. Although, to install an initial tvOS beta, it is required to have the Apple TV connected to a computer with a USB-C to USB-A cable, with the software downloaded and installed via iTunes.
