Apple updated the specs page for HomePod, with the full list of supported audio sources:

Apple Music

iTunes Music Purchases

iCloud Music Library with an Apple Music or iTunes Match subscription

Beats 1 Live Radio

Podcasts

AirPlay other content to HomePod from iPhone, iPad, iPod touch, Apple TV, and Mac

iCloud Music Library support was the one that left a lot of us scratching our heads last week. Good to know it’s officially supported. This means any music in your personal library is available through HomePod, even if they are tracks that aren’t available in Apple Music or the iTunes Store.

★ Thursday, 1 February 2018