What is LEAN BACK / what sources fall under this category?

During a user's discovery journey in the app, LEAN BACK (LB) refers to user views that originate from programmed sources in-app; essentially meaning the user discovered / viewed a Feels Music Message (Feels) while browsing the app, as opposed to actively seeking out a particular artist/song. LB sources include:

• Homepage Carousel section

• Homepage Featured Collections section

• Homepage Trending Feels section

• Discover (currently Search) categories section

• YouTube Music Trending section (under the Create tab)